Home of the Best Hk USC to Hk UMP Conversion using real

Hk UMP parts

Competition can only do one thing, lower their prices down to their low quality. That one dollar less that you pay for "others" parts will not be any savings at end...I guarantee it!

The first left one is the SBR UMP clone, the two on the right are the real UMP's

TRIO SBR UMP clones in .45ACP - 9mm - .40S&W calibers

Stock Block "A" -  This conversion show the stock block "A" being used, this was our fix for the Grease gun mag Kit and UMP conversion that was offered by other vendor Special Weapons/Top Notch, it has the polymer stock block or (transition piece), the polymer blocks has the  aluminum insert and it will turn in itself after some time requiring two tools and lots of patience to disassemble. Only 50 were made and no more block "A"s will be made, sorry for those that keeping asking.

Stock Block "B"   -  $195.00 for finished USC to UMP stock block and screws. All new Block B's will have the long cross block steel  screws with eyelet/flat thumb ends ready, the screws are parkerized and Teflon Molly coated in black

 ( IN  STOCK NOW )

Please remember,  e-mail is the best way to contact me, and FAX is the best way to place an order (423) 479-0575,  click here for e-mail : DefenseArms@aol.com

STOCK BLOCK "C" - $165 -

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

STOCK BLOCK "C" AK- $355 -

 ACE Hinges / ACE stock all mounted and ready to install (compliance part) (In stock)

ACE stocks come in 3 sizes, Long, Medium and Short. Also come with a detachable shoulder pad.

The ACE brand 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- $365

  ACE Hinges / AR/M16 adaptor/ 6 position M4 reinforced stock , photo show w/battery compartment, 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

 If you already have your USC, you can ship it to us for the conversion and here is the break down in prices, you choose what you want for parts or services, turn around is 3~4 days for full conversion but you must e-mail to get in the schedule.
 

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 ( * ) (ALL HK PARTS ARE GENUINE AND FACTORY NEW, NOT USED FROM PD's in brown paper, price changes reflected from distributor prices

 UMP Lower Conversion

-PARTS LIST-  See PICs on Parts section

$ 198 ( Incoming Soon Now)    (ATTENTION  B&T brand will not work as it was not built for the UMP but MP5)

$ 195- STOCK BLOCK "B"- Come with long cross eyelet/thumb flat screws in black already!! (IN STOCK AGAIN !!)

 $    8- HK roll pin new style (IN STOCK)

Note that this is compatible with HK UMP, G36, SL8 and USC, with rounded edges NOT sharp edges like others, and also ALL STEEL construction not aluminum like other after market part.

 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

Set of Screws with Sling Loop/Thumb Flat  to attach stock block to upper receiver , two models will be offered, one with eyelet for the sling and other with thumb flat and Hk logo engraved at top. They are parkerized and teflon molly coated in flat back.

=>>Works on Standard USC/SL8  and  UMP  conversion   (will not work on right side G36 folder)

Buy a pair for $42  (IN STOCK)

Mill UMP Bolt to work with USC receiver - $95  (done right without heat transfer)

Upcoming Projects for the USC

1- Upper receiver to accept all USC/UMP internals (for those that asked me over and over...it's coming, now you will be able to have that  UM-Pistol)

2- Stock Block "C" for Made in US folding stocks, and folding stocks.

3- Tab to lock folding stock to upper receiver

4- Fake UMP look a like sound suppressor

HK UMP - USC RAILS

Mil. Specs Picatinny Rails

See the differences, double click for bigger image

Pics show unfinished barrels, all barrels are finished Gray or Black!!

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 many years...

Those barrels are made from blanks of 4140 Chrome Molly Steel, turned on centers, machine finish. Stress relieved & Air gaged to +/-  0.001" ~ 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)

UMP HDPS 7.87" Barrel $215  (IN STOCK)  Stainless Steel  HK UMP barrel

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

Make no mistake, we are the only ones offering those barrels in the very same HK German specifications, just compare the UMP barrel profiles.

UMP HDPS barrel test fire at 25 yards, fired 7 rounds only so would not destroy the target and you can see the hits...and I did not really put much effort, stand up position, no sling.

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

If you want a HK UMP conversion done in 9mm, 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.

ATTENTION, before you send a conversion in, please pay attention on your hammer first.

Hammer without a relieve in the right side will be problematic, usually they are found in the G36 lower grips, but will not work in the USC/UMP unless the relieve is made.