Hk -  Colt - FN - HDPS Parts

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 Compliance parts for USC/UMP and SL8/G36 conversions

G36 Bolt  - $185.00  (compliance part) (not just another A.M. part, this part meets and exceeds the standards!!!)  in stock      Click here for manufacturing explanation =>

G36E/SL8 Operating rod - $48 (compliance part)  in stock

G36 Magazine Floor Plate - $22 (compliance part)  in stock

G36E/SL8 Gas Piston - $50 (compliance part)  in stock

$385  (in stock - 5 parts Kit, trigger, floor plate, bolt, gas piston, operating rod)

For USC conversions you will need to combo it with the HDPS trigger, mag follower, floor plate, barrels and AK or M16 folding stocks (need choose 3 U.S. made compliance parts)

  (U.S. barrel and U.S. stock prices are bellow,  don't forget if using a M16 or AK style folding stock, the stock will count one US made compliance part)

$150 (in stock - 3 parts Kit, trigger, floor plate, follower)

For SL8 conversions you will need to combo it with the HDPS trigger, gas piston, operating rod, G36 bolt and floor plate (need 5 U.S. made compliance parts)

$385 (in stock - 5 parts Kit, trigger, floor plate, bolt, gas piston, operating rod)

                    NEW     NEW     NEW     NEW     NEW     NEW     NEW     NEW

HDPS Faux Sound Suppressor for the Hk USC

(Kit includes the Faux Sound Suppressor, lower rail and screws)

Realistic looks of the real Sound Suppressor available for the Hk UMP's,  integral one piece milled from a solid Aircraft Aluminum Grade cylinder, no parts to get loose, slip over 16" barrel, comes with all hardware needed to fasten the FSS to the receiver NOT to the barrel like other brands, DON'T scratch/ruin your USC barrel with others fake cans using pressure fit or screws directly to the barrel.

-Note- for those that do not have the lower UMP vent milled, the kit will come with a self adhesive template showing where to drill the two holes for the screws.

The engraving will be in black, unless you specify you want it in white, you can also fill up the engraving with any other color yourself if you like.

$125 (IN STOCK)  (This is a FAKE  Sound Suppressor, not NFA or require any registration)

NOW WITH  NEW HDPS FINISH SYSTEM, SCRATCH RESISTENT !!

-USA made by HDPS Steel eyelet and thumb LONG cross block with flat and eyelet screw (pair)

Also available, long cross stock block set of screws with eyelet and flat thumb ends. Just drill a 7mm hole thru existent threads in stock block and upgrade for all steel screws. Upgrade services for existent Block B owners will be available. 

Buy a pair for $48  (IN STOCK) 

HK UMP - USC RAILS

Mil. Specs Picatinny Rails

See the differences, double click for bigger image

ATTENTION, MAKE SURE THAT YOUR ACCESSORY WAS MADE FOR MIL-STD-1913 PICATTINY ARSENAL RAILS

No other outfit have this quality at low price, they are our FOURTH generation and IMPROVED with NO sharp edges, upper rail is just a little over 1" longer but give you almost 2" for  more choices to fit your scope or sight, rounded front face for snag free and 100% base contact with receiver giving you  a complete rail stability. Lower rails no longer have the notches for KAC covers, they were just another sharp points and we have now a variety of snap on much cheaper rubber covers for those rails that don't use those notches anymore.

And don't forget, those are not just anodized, they are Class 3 Mil specs hard coat anodized, no milling marks and in flat black.

Sold hundreds to SWAT TEAM's, SRT's and Government Agencies, real action tested!

UMP/USC Long Top Rail and 2 Low Profile Screws , NO sharp edges -$ 40.00 (in stock)

UMP/USC Short Front Rail and 2 Low Profile Screws  NO sharp edges - $ 30.00  (in stock)

UMP/USC Set of Rails/screws in blister pack  NO sharp edges - $ 125.00 (in stock again!!)

NOW WITH  NEW HDPS FINISH SYSTEM, SCRATCH RESISTENT !!

G36 and  SL8-6 - Extended Bottom Rail and 2 Low Profile Screws   NO sharp edges $ 32.00 each (laser engraved "B" numbered (in stock)

G36 - Side  Rail and 2 Low Profile Screws  NO sharp edges $ 30.00 each (laser engraved "R" and "L" numbered (in stock)

SL8/6 - Side  Rail and 2 Low Profile Screws  NO sharp edges (out of stock)

(NEW and IMPROVED , Built in Buffer/Recoil rod housing, included steel cross block eyelet/thumb screws.......IN STOCK NOW

NOW WITH  NEW HDPS FINISH SYSTEM, SCRATCH RESISTENT !!

HK SL8 -1 or 4 and HK SL8 -6 to G36  Stock Block Conversion, steel screws included- $295  (in stock) 

-HK genuine G36 Folding stock roll pin (alone) - $10.50 (in stock)

-HK genuine G36  push pin - $32 (IN STOCK NOW, finally  got it from HK...all new, not used)

-HK G36 Mag Well - $85 (in stock)

-HK G36 FBI pistol grip - $285 (in stock)

-HK G36 2rb pistol grip - Safe/1/2 - $275 (in stock)

-HK G36 NAVY pistol grip - $285 (out of stock, more coming)

-HK G36 NAVY pistol grip  w 2rb- $285 (in stock)

-HK G36 "C" Folding stock w/ cheek piece-  $185 (in stock)

-HK G36 "C" Folding stock - $165 (in stock)

-HK G36 "E" and "K" and "C" Folding stock - $95 (used)  (E only in stock)

 Differences between USC/UMP Stock Blocks

    1 - Stock Block "A" that will work with M3 lower from TN and clipped  HK UMP lower (only 50 were made for those that have asked for replacement of Special Weapons/Top Notch transition part because problems with threaded insert turning in itself or tear/broken polymer blocks)

    2 - Stock Block "B"  that will work with un-modified HK UMP lower

    3 - Custom stock block "C" to be used with U.S.A made  stocks

Stock Block "A" (out of stock, no longer will make stock block "A")

STOCK BLOCK "B" - $195.00 for finished stock block and screws. All new Block B's will have the long steel  screws with eyelet/flat thumb  ends ready. ( IN  STOCK NOW )

NOW WITH  NEW HDPS FINISH SYSTEM, SCRATCH RESISTENT !!

USC to UMP conversion COMBO (NEW ITEM)

-  With this combo set you have everything you need to legally  convert your standard USC Thumbhole Stock and 10 rounds mag to UMP Pistol Grip and hi capacity mag. All HK German parts are new, the 3 U.S.  HDPS made compliance parts are already installed (steel trigger, follower and floor plate), the lower already serviced to make it compatible with the USC upper. The only thing you will need to do is take off a small portion of material from your upper so the UMP large capacity mag can work with it, instructions attached.

Combo components:

PARTS- HK UMP lower, 2 HK UMP magazines, HK UMP folding stock, HK  Folding stock axle pin, HK UMP buffer, HDPS stock block B with steel screws, HDPS steel trigger, 2 HDPS mag followers and 2 floor plates.

SERVICE INCLUDED- Fill and Mill auto sear area, make  UMP lower compatible with USC upper, replace all UMP parts with USC parts, replace mag followers and floor plates and for the NAVY style UMP lowers, invert white mark on right side USC selector.

COMBO with FBI Style  UMP lower - $ 1,195.00  You will need send your USC lower in order to use your semi auto internals (IN STOCK)

COMBO with NAVY or 4 Position Style UMP lower - $ 1,225.00  You will need send your USC lower in order to use your semi auto internals (IN STOCK)

    (installed on Block C and M16 folding/collapsible stock)

 HDPS Push Button  Hinges

(NEW ITEM)

Those are made out of steel, NOT steel and aluminum, they are easy and fast to open/close and have a positive lock in and even a no-play set screw. It's compatible with all ACE brand attachments, you can use it in a large variety of firearms, HK, AK, Daewoo, AR15/M16, SIG 556, FAL, AR180 and others.

Push Pin  Hinge and hardware (all steel) -  $58  (in stock) (introduction price!! over $30 cheaper from other brands made from aluminum )

 HDPS Skeleton Stock

(NEW ITEM)

Those are made out of hi quality aircraft grade aluminum, tubes are also aluminum, NOT plastic. Sturdy and made to outlast your firearm. Compatible with HDPS all steel hinges and all ACE brand accessories, you can use it in a large variety of firearms, HK, AK, Daewoo, AR15/M16, SIG 556, FAL, AR180 and others. Stocks size is  8.5", which will give the same total length of the UMP folding stock set up.

HDPS Skeleton Stock and hardware - $48 (in stock) (introduction price!! over $20 cheaper from others brands with top tube made from plastic)

HDPS Skeleton Stock w/ top tube foam pad and hardware - $58 (in stock)

Rubber pad .5" - $12

STOCK BLOCK "C" - $165 -

 STOCK BLOCK "C"  with Steel eyelet/thumb flat screws  (In stock)   

                    (photos show old hinge style, they come withpush button now))

 STOCK BLOCK "C" AK- $305 -

 HDPS Push Button Hinges / HDPS skeleton stock all mounted and ready to install (compliance part) (In stock)

The HDPS stock and hinges can be purchased with Block "C" or you can purchase the Block only and install the folding stock yourself. It can be made to fold to the Left or Right. Advantage in this set up is ZERO flex unlike the UMP polymer stock, positive locking open or closed, no rattle....an excellent feel for those that actually want be able to fire the weapon with comfort and precision and not only looks.

ALSO- the stock can be the THIRD U.S. made compliance part!!

STOCK BLOCK "C" M16- $325 -

 HDPS Push Button Hinges / AR/M16 adaptor/ 6 position M4 reinforced  (show in photo w/ battery compartment that's no longer available) (In stock)

Preferred set up by SWAT TEAM Members

ALSO- the stock can be the THIRD U.S. made compliance part!!

For comparative purposes, this was HK solution using the M16 collapsible stock, they made  the stock to fold to the right side in a sharp angle to clear the ejection port, but close the access for the trigger....

  original HK UMP with M16 collapsible stock

HK roll pin new style for  USC/UMP conversion (I finally got those in stock from an order  dated 03/06) -

$12.00 - HK  UMP roll pin new style   (IN STOCK AGAIN !!! )

$22.00 - HK UMP Stainless Steel Roll Pin  (IN STOCK)

Advantages of HDPS CORP. Barrels

Those are the HDPS CORP production UMP and USC Barrels made with the cutting edge CNC machinery by Green Mountain Rifle Barrels Co., a company  in the specialty business of only make quality barrels for 31 years...

Those barrels are made from blanks of 4140 Chrome Molly Steel (Stainless Steel for the UMP Barrels), turned on centers, machine finish. Stress relieved & Air gaged to +/- .0002".

You can find reproduction barrels for the UMP and USC in two places only, BUT you will find the exact specs of the originals German made only here. Just compare the UMP barrel. Our barrel is an exact reproduction with all German specs. not a  low profile barrel.

Also, our USC barrels have the same design of the UMP barrel by the chamber face allowing :

1- The use of a 16" barrel in the UMP, so PD's and Govt. Agencies that always wanted a little more speed and accuracy on their  UMP's, now have a choice for a quick barrel swap.

2- All barrels are compatible with USC bolt/carrier AND UMP bolt/carrier!!

Important - Third Version of Barrel "USMP" is a 16" with  the UMP flange.

USC  HDPS 16" Barrel  $200 (IN STOCK)

 HDPS UMP barrel 7.87" in Stainless Steel in Black only- $215 (IN STOCK) 

Hk NEW German USC barrel on 7.87" threaded 16X1 RH or LH - $ 395 (IN STOCK)

USMP HDPS 16" with UMP flange $210 (IN STOCK)

The new HDPS UMP Stainless Steel barrels are the best solution for your registered SBR as you may plan to attach a Sound Suppressor or a Flash Suppressor and you can trust that it will stay tight there, other solutions can only become a serious problem, example.... cutting an USC 16" barrel that has a twist rate for it's length and solder a tip to it is a recipe for a catastrophic failure.

Special Notes:

Be aware of after market brands offering a "magical" special refinish on those barrels, is no such thing, those barrels must be between +/- 0,001"~0,002"  and in order to apply such special finishes their barrels in order to work must be under the specifications to make up for the thickness of their finish, once finish wear out you also have an out of specs barrel flange.

Also, about 9mm and .40 S&W barrels, we are not offering them because would be the same of selling a car without an engine as the UMP 9mm and .40S&W bolts are not  available for sale and very difficult (and expensive) to find.

If you want a HK UMP conversion done in 9mm or .40 S&W, make sure to ONLY USE HK parts, several people that purchased after market brand of UMP and USC 9mm barrels ended up with an expensive paper weight due to specifications and not being able to find a 9mm bolt.

 FYI-  Upcoming Projects for the USC

1- Fake UMP look a like sound suppressor

2- Tab to lock folding stock to upper receiver

3- Real Sound Suppressors line

4- Alloy Upper receiver compatible with USC  parts

HK USC .45 cal ORIGINAL  GERMAN HK 16" barrel (NEW UNFIRED- take off from my  own SBR's)

Is a take off from NIB Carbine, 100% new, cannot be imported or sold separated by HK, hard to find item for replacement or custom work, you chance to buy it now. Will cut and thread for your SBR and Sound Suppressor e-mail for more information.

$299.00 (IN STOCK)

PS90 ORIGINAL 16" Barrel and Flash Suppressor/Sleeve Genuine FN, not drilled, is a take off from a NIB PS90 by our exclusive system, if you ruin your barrel and looking for a replacement on an almost impossible item to get, here is your chance! $325.00 (IN STOCK)           HK UMP/USC .45 Carbine HDPS 45-50 DRUM  Sick and tired of that USC 10 rounds magazine? Get a HDPS DRUM and get tired of pull the trigger !!Easily load 40 rounds by hand and go up to 50 with a loader, as in all drums, not open bolt on last round. This drum is actually shorter than the HK 25 rounds magazine and completely loaded equals in weight fully loaded 2 25 rounds mag clamped together   HK UMP Lower 45-50 DRUM -  $285.00 (OUT  OF  STOCK!!) HK USC  Lower 45-50 DRUM -  $275.00 (OUT OF STOCK, those are also banned on  States that still have the AW Ban, no many buyers in the US and mostly were exported, no longer will be produced)    *(ALL HK PARTS ARE GENUINE AND FACTORY NEW, NOT USED FROM PD's, price changes reflected from distributor prices)   HK SL8-1 Original factory 10 rds magazines $45 each (in stock)   HK USC .45 Carbine - Original 10 rounds magazines, they are new and genuine HK $65 (in stock)   HK UMP .45 SMG- Original 25 rounds magazines, they are new and genuine HK $75 (in stock) HK UMP .45 FBI LOWERS- Complete with all internals, are new and genuine HK, you can also use them with the USC semi parts, just remove the full auto parts and replace with semi parts for your USC/UMP conversion. $395 (IN STOCK) HK UMP .45 NAVY LOWERS- Complete with all internals, are new and genuine HK, you can also use them with the USC semi parts, just remove the full auto parts and replace with semi parts for your USC/UMP conversion. $399 (IN STOCK) HK UMP .45 NAVY LOWERS With 2 Round Burst $        (out of stock) HK UMP .45 SMG  Folding stocks -Those stocks are new and genuine HK, will work in the UMP/USC conversion kits. $205 (in stock) HK UMP .45/.40 SMG Flash Suppressors -  For .45 cal. and .40 cal., made by B&T for HK $179 (out of stock,  B&T discontinued this part and is no longer available, HDPS will be making it along with our Sound Suppressors) HK G-36 / SL8-1 / UMP .45 / USC.45  SLING - Those are the genuine HK factory slings, hard to find anywhere and priced right! $68  (in stock)  HDPS Vertical Forward Grip, excellent grip and texture and better than other expensive brand, the lowest price anywhere!! $19 (in stock) HK Gun Lock - New Original factory HK Gun Locks, hard to find item and soon to be collectable,  $55 (in stock) HK  G-36 / SL8-1 / UMP .45 / USC.45 - New Original factory HK Combo Tools, hard to find item and soon to be collectable item- $45 (on order) HK  USC.45 Original Factory Stocks - Comes with buffer - $35 ( Gray in stock) Have factory BLACK in stock $45 HK  USC.45 Original Factory Lower Receiver -  Stripped, comes with Mag Release lever - $35 (in stock, also ) Have factory BLACK in stock $35  AR-15 9mm Magazines - New production 30  round magazines for your COLT AR-15 in 9mm, those have polymer bodies $35 (in stock) COLT AR-15 SP-1 Kit  All parts are COLT and you have here everything but the lower receiver.  If you wish to build a post ban AR, I can shave the bayonet lug and replace the flash suppressor with a fake flash suppressor for legality. (out of stock)      M4 Reinforced 6 Position Collapsible stock, water proof 4 batteries reserve compartment, nice rubber pad. The lock is rock solid and they have an excellent overall fitting and quality!! $85 (out of stock)    M4 latest reinforced model of 6  position collapsible stock with  buffer, spring, locking piece and castle nut. $85 (in stock) COLT A3 Removable Carry Handles - New from M4's take off - $155 (in stock)  NEW- Rock River Arms M4A3 upper, complete and ready for your Pre Ban lower, A2 flash suppressor, M4 16" barrel profile with the M203 grenade launcher step, bayonet lug, side sling attachment as well vertical, M4 shielded over sized hand guards, flat top upper, charging handle and bolt/carrier. Also includes the new A3 carry handle with an integrated picatinny rail and side extra battery air/water tight storage ($175 stand alone  value) $585 (out of stock) Used in excellent conditions, COLT complete 20" upper TARGET model, A2 sights, forward assist, shell deflector, A2 flash suppressor, charging handle, bolt/carrier. It can be configured to post ban (flash suppressor will be replaced with a pined muzzle brake/fake flash suppressor) $495 (have few in stock) New and unfired, same of above  $675 (out of stock)   Used in excellent conditions, COLT complete 20" upper H-BAR model (heavy barrel under hand guards), A2 sights, forward assist, shell deflector, A2 flash suppressor, charging handle, bolt/carrier. It can be configured to post ban (flash suppressor will be replaced with a pined muzzle brake/fake flash suppressor) $550 (out of stock) Used in excellent conditions, COLT 20"  upper H-BAR model (heavy barrel under hand guards), A2 sights, forward assist, shell deflector, A2 flash suppressor, 1/7 twist. It can be configured to post ban (flash suppressor will be replaced with a pined muzzle brake/fake flash suppressor) $195 (out of stock) Used in excellent conditions, COLT A2 complete upper receiver, A2 sights, charging handle, bolt/carrier, forward assist, shell deflector $345 (out of stock) Used in excellent conditions, COLT A2 complete carrier/bolt group (out of stock) NEW- Rock River Arms M4A3 stripped upper, hi quality part and all mil. spec. $135 (out of stock) ALSO LOWER RECEIVERS $125!! (out of stock) "USED in good/excellent conditions" Unknown Brand un shielded-$4 set (out of stock)

COLT complete A1 Pistol Grip Surplus - They are fully operational just with handling marks, nicks and some a marbled ( for the collectors),  will sell by bag of 10- $10 (out of stock)

COLT  A1 with and without trap door and A2 Surplus Stocks - No buffer tube/spring/ buffer, just cosmetics and dirty, no cracks or broken. Will sell by bag of 5 of your choice - $20  ( out of stock)

COLT  A1 Triangular hand guards for your M16 or SP-1  or SPII- Good conditions - $15 set (out of stock)

COLT M4 fat Double Shielded Hand Guards - $40(in stock)

RRA M4 fat Shielded Hand Guards- $15(in stock)

Double sling side loop for stock - $10(in stock)

Old Style Collapsible stock cheek piece with battery compartment - $15(out of stock)

Old Style Collapsible stock Rubber Pad - $10(in stock)

Ruger Mini 14/30 Hand Guard (new) - $15(in stock)

COLT A1 and A2 pistol grips (excellent) - $10 each  ( just a few)

OD Green A2 pistol grip (new)- $8(in stock)

OA93 Style pistol grip w/ compartment - $15(in stock)

CAT Trigger enhancement system- $18(in stock)

Hell Fire 2000 trigger enhancement system - $10(in stock)

Two Position Collapsible Stock like COLT but not marked, complete - $40(isold)

Four position Collapsible Stock, complete and unknown mfg. - $25(sold)

Old Style A1 COLT Stock Buffer.....collectible $25(out of stock)

Several brand names are cited on this site like COLT, SIG, H&K, UZI, FN, those are registered trademarks of those brand names, and are used here as a reference to the genuine COLT, SIG, H&K, UZI parts that HDPS CORP sells, or because HDPS CORP offer services on COLT, SIG, H&K, UZI weapons. Is to be clear that HDPS CORP is not affiliated with COLT, SIG, H&K, UZI, FN in any other way.