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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
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.
LENGTH
Stock only:
-Long - 9.5"
-Medium - 8.5"
-Small - 7.5"
-Block C and hinge - 1"
-Shoulder rubber pad - .5"
HEIGHT
- Same of UMP stock, but adjustable .5" up or down
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.
*****************************************************************
(
* ) (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)
$ 165-
STOCK BLOCK "C" with Steel eyelet/thumb
flat screws
(In stock)
NEW ITEM!
$ 355- STOCK BLOCK "C" / ACE Hinges / ACE stock all
mounted and ready to install
(compliance part)(In
stock)
$ 365- STOCK
BLOCK "C" M16ACE Hinges / AR/M16 adaptor/ 6 position M4
reinforced stock
(In stock)
$ 375 HK UMP
NAVY lower
(IN STOCK)
$ 325 HK UMP FBI lower
(IN STOCK)
$ 135
Made in USA UMP/USC trigger
(compliance part)
(IN STOCK)
$ 11 Made
in USA UMP mag floor plate (compliance part)
(IN STOCK)
$ 22 Made in USA UMP mag follower (compliance part)
(IN STOCK)
$
210 USA made by HDPS USMP barrel 16"(compliance
part)-
(IN STOCK)
$ 200 USA made by HDPS USC barrel 16"(compliance
part)-
(IN STOCK)
$ 215 USA made by HDPS UMP barrel 7.87" in
Stainless Steel-
(IN
STOCK)
$ 42
USA made by HDPS Steel eyelet and thumb flat screw (pair)
For
Thumb Flat Screw, you need to specify if is for folding
stock or fixed stock,
gray, black, with or without HK logo
(you will receive a plain screw if no specify)(IN STOCK)
$ 40 Upper rail
(IN STOCK)
$ 30 Front rail/each
(IN STOCK)
$ 25 Vertical Grip
(IN STOCK)
$ 75 New UMP mag
(IN STOCK)
LABOR
LIST
$ 35 labor
to turn UMP lower to work together with USC upper --( using Stock
Block B)
$ 30 Labor to invert white mark at USC selector if using NAVY
lower
$ 15 Replace internals
$ 45 Engrave Polymer receiver for SBR
$ 18 Mill upper receiver to accept the UMP
Mag
$ 75 Mill Rt. and Lt. UMP and lower vents in front receiver
$ 45 Dye Job on Upper Receiver only (Industrial Dye)
$ 25 Labor to completely close with polymer the Release Lever Catch front section in
the UMP lower, pin is modified to prevent slide out and
top of the fill is milled out ( this service prevent the lower to be used in full auto
function by replacing the disconnector, most call it wrongly as Auto Sear). This also helps to
secure and create a strong base for the front slim plastic wall
that hold the strong hammer springs.
(click
on thumbnail pics for bigger photo of this service).
$ ?? Shipping back to you
-NOTICE- OLD
STYLE UMP lowers require some extra milling and fitting, add $20
for those old lowers.

Made in USA UMP/USC
ALL STEEL
trigger
(compliance part)
is
IN STOCK -
$ 135
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.
Also, check on Parts section more photos of our new improve top rail
for UMP/USC

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
(SOLD OUT
FAST !)
HK USC Lower 45-50 DRUM - $275.00
(OUT OF STOCK,
those are also banned on banned States, no many buyers
in the US and mostly were exported, no longer will be
produced)

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
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.

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