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Disclaimer

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, FN parts that HDPS CORP sells, or because HDPS CORP offer services on COLT, SIG, H&K, UZI, FN weapons. Is to be clear that HDPS CORP is not affiliated with COLT, SIG, H&K, UZI, FN in any other way.


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

Hk UMP parts, this is the closest you can get to the real Hk UMP LEGALLY!


 About Compliance parts for USC/UMP conversions

All conversions Title 1 (transfer like any other firearm) or registered SBR's (NFA) done by HDPS CORP. comply 100% with BATFE regulations regarding imported parts count in an Imported Assault Rifle 18-U.S.C. section 922(r). and also rendered impossible to modify for illegal full auto. 

Please if you are just purchasing parts, make sure to have your conversion done in compliance. Compliance parts for Title 1 conversions   and SBR's are  available to choose the needed 3 parts.

Warning, failure to comply will render your conversion illegal living you at mercy of $250,000.00 fine and up to 10 years in Fed Jail charges. Please be safe, be compliant !

 

Also note that another brand of conversion that uses a lower receiver/pistol grip as one piece, original USC lower and long stick 20 rds magazine, all their parts ARE NOT made in U.S. and none of them count as compliance parts! Don't make an illegal mistake!

See other important Warning at the end of this page.

 


 

 

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

 


USC to UMP stock block "B"

            

 

Disassemble sequence for Block "B" or "C"

                       

 


    

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

á( IN  STOCK NOW )NOW WITH  NEW HDPS FINISH SYSTEM, SCRATCH RESISTENT !!


  

   

HDPS  Bird Cage Hk style  Flash Suppressor for Hk UMP / USC SBR's .45 ACP and .40 S&W  for Flanged barrels

Another quality part available for PD's and Government Agencies issued UMP Sub Machineguns or Civilians USC/UMP SBR conversions. The factory made FS's were discontinued and no longer available, so here is your chance to have it.

$145 (in stock)  

 


  

     

HDPS 5 prong Hk style Flash Suppressor for Hk UMP / USC SBR's .45 ACP and .40 S&W forFlanged barrels

 

Another quality part available for PD's and Government Agencies issued UMP Sub Machineguns or Civilians USC/UMP SBR conversions. The factory made FS's were discontinued and no longer available, so here is your chance to have it.

$145 (in stock)  


       

HDPS  Bird Cage Hk Style Flash Suppressor for Hk UMP / USC SBR's .45 ACP/.40 S&W/9mm for  Threaded Barrels in M16X1 LH

Patterned after the Hk UMP flash suppressor for flanged barrels. This Flash Suppressor is ideal for those that currently have a threaded short barrel on M16X1 LH to share the  same Sound Suppressor with your Hk USC SBR and your Hk USP Pistol, not only protects your thread but also looks awesome and at same time suppresses the flash.

$120.00  (in stock)


                      

HDPS  5 Prong Flash Suppressor for Hk USP .45 ACP Pistols and also works on UMP / USC SBR's .45 ACP/.40 S&W/9mm for Threaded Barrels in M16X1 LH  

 Another quality part by HDPS! - This Flash Suppressor is ideal for your USP Tactical Pistol.  It's 5 not 4 prongs available elsewhere, enhance accuracy by 35%, reduce recoil by 40%, no indexing needed with 5 prongs! balance your pistol for improved overall shooting

$65 (in stock) best quality at the lowest price you can find!


           

This is an all steel construction .45 Cal. THIRTY rounds magazine HDPS CORP modified to fit your Hk UMP SMG lower or on your Hk UMP lower for your USC conversion to UMP.

Refinished in Teflon Molly Coat SOCOM Black and flawless performance, you get 30 rds instead 25  rds 
AND  the magazine itself will count the 3 needed U.S. made compliance parts to meet the 922.r legal status (great value!) It will not lock the bolt open on last round, but delivers performance and reliability as the 25 rds Hk magazine.

Limited quantities, get yours now!

$105  (in stock, VERY limited quantity)   Magazine for UMP lowers


NEW     NEW     NEW     NEW     NEW     NEW     NEW     NEW

                                           

HDPS made  Hk UMP and USC Hardened Stainless Steel EJECTORS( .45 ACP - .40S&W and 9mm ) 

$35.50

 


 

                   NEW     NEW     NEW     NEW     NEW     NEW     NEW     NEW

NEW AND UPGRADED 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, AND REMEMBER,  you are getting a $30 value short rail with it.

-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.

$125  out of stock

 (This is a FAKE  Sound Suppressor, not NFA or require any registration)

NOW WITH  NEW HDPS FINISH SYSTEM, SCRATCH RESISTENT !!

 


 (ATTENTION  B&T brand folding stock will not  work as it was not built for the UMP but for the MP5 receiver adaptor, and the after market U.S. made stock IS NOT with Hk specifications so will not work)

 

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

$48 - Thumb screw and eyelet screw  (In stock) 

 


                           

$ 165- STOCK BLOCK "B"- Come with long cross  pin, washer and  sling ring !!  (In stock) 

$ 25 - Pin/ Washer/ Ring  (In stock) 

 


$22.50 - HK  UMP roll pin new style   (In stock) 

$32.00 - HK UMP roll pin Stainless Steel  (In stock) 

 


$165- STOCK BLOCK "C" with Steel eyelet/thumb flat screws  (In stock)   

 

$140- STOCK BLOCK "C" with pin/ wahser/ ring (In stock)


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

 STOCK BLOCK "C" AK- $305 - (out of Stock)

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

Stocks size is  8.5", which will give the same total length of the UMP folding stock set up.
 
 
-Block C and hinge    -   1"
-Shoulder rubber pad -  .5" 
 
 HEIGHT
 
 - Same of UMP stock, but adjustable .5" up or down

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 - (out of Stock)

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

 


 

NEW     NEW     NEW     NEW     NEW     NEW     NEW     NEW

                                           

HDPS made  Hk UMP and USC Hardened Stainless Steel EJECTORS  ( .45 ACP - .40S&W and 9mm ) 

$35.50


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.
 


  
                                                               

 UMP Lower Conversion


-PARTS LIST-  See PICs on Parts section

 

 

$32.00 - HK UMP Stainless Steel Roll Pin  (IN STOCK)

$22.50 - HK  UMP roll pin new style   (In stock)

$ 165- STOCK BLOCK "C"  with Steel eyelet/thumb flat screws  (IN STOCK)   

$   HK UMP 4 position lower   (safe/semi/burst/full)  (IN STOCK)   

$   HK UMP NAVY lower    (IN STOCK)   
$   HK UMP FBI lower
  NOW AVAILABLE FOR SALE ONLY WITH THE OFFERED COMBO 

$ 135  Made in USA UMP/USC trigger (compliance part) (IN STOCK)

$   11 Made in USA UMP mag floor plate (compliance part) (IN STOCK)(CNC from a  T7 aluminum billet)
$   22 Made in USA UMP mag follower (compliance part)
(IN STOCK) ((CNC from a  T7 aluminum billet, NOT A  HOMEMADE PLASTIC PART FROM ELSEWHERE))

$ 310 USA made by HDPS USMP barrel 16"(compliance part)- (IN STOCK)
$ 300 USA made by HDPS USC barrel 16"
(compliance part)- (IN STOCK)
$ 285 USA made by HDPS USC/UMP barrel 7.87" in
Stainless Steel in black only (compliance part)- (IN STOCK)

$ 495 Hk NEW German USC barrel on 7.87" threaded 16X1 RH or LH (IN STOCK)

$ 325  HDPS NEW  USC/UMP barrel on 7.87" threaded 16X1 RH or LH (IN STOCK)

$  35  USA made by HDPS Steel  eyelet and thumb flat small screws (pair) for standard USC and SL8 and first generation Block B  (IN STOCK)

$  48 USA made by HDPS LONG Steel  eyelet and thumb flat screw for Block B or C (pair)  (IN STOCK) 

$  25  Pin/ Washer/ Ring  for Block B or C  (In stock)  

$  40 Upper rail (IN STOCK)
$  30 Front rail/each
(IN STOCK)
$  19 Vertical Grip
(IN STOCK)
 

$125  Upgraded  HDPS Faux Sound Suppressor (includes one short rail! - IN STOCK)

LABOR LIST

 

 

$  40 labor to turn  UMP lower to work together with USC upper
$  30  Labor to invert white mark at USC selector if using NAVY lower
$  20  Replace internals
$  60  Engrave Polymer receiver for SBR

$  25 Mill upper receiver to accept the UMP Mag
$  85  Mill Rt. and Lt. UMP and lower vents in front receiver 
$  60  Dye Job on Upper Receiver only (Industrial Dye)

$  30  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.


Compliance Parts for the USC

For USC conversions For USC Kit price just add the price of the three parts you choose from the four available ( See listed barrel and stock prices)  don't forget if using a M16 or AK style folding stock, the stock will count one US made compliance part)

  For USC 3 parts Kit price , Trigger, floorplate, follower - only $150 (save purchasing the Combo)

 

         

 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.

 

HK UMP Floor Plate in the right side and HDPS Floor Plate in the Left side

HK UMP Floor Plate (compliance part)- $11.00  (All parts are engraved HDPS USA, ALUMINUM made) (in stock)

HK UMP Follower  (compliance part) - $22.00  (CNC from T7 ALUMINUM billet, Type III Mil Specs Hard Coat anodized in Red) (Not a homemade plastic part from elsewhere) (in stock)


  

-USA made by HDPS Steel eyelet and thumb flat screw  and eyelet screw (pair) for  STANDARD  SL8

=>>Works on Standard USC/SL8 

For Thumb Flat Screw, you need to specify if is for folding stock (old stock block) or fixed standard OEM stock

$ 35 (out of  STOCK) 

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

$48 (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) -  $ (Out of 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 - (out of Stock)

HDPS Skeleton Stock w/ top tube foam pad and hardware - (out of Stock)

Rubber pad .5" - (out of Stock)


              

USC to UMP conversion COMBO (NEW < L O W E R >  PRICES !!!!)

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)those parts make the conversion legal per ATF rules, the lower already serviced to make it compatible with the USC upper.

Combo components:

PARTS- HK UMP lower, 2 HK UMP magazines, HK UMP folding stock, HK Folding stock axle pin, HK UMP buffer, HK USC internals *, HDPS stock block B with steel screws, HDPS steel trigger, 2 HDPS mag followers and 2 floor plates (the 3 U.S. required compliance parts)

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, R&R all parts and check dry fire function test.

COMBO with FBI Style UMP lower - $ 1,450.00 (IN STOCK)

COMBO with NAVY Style UMP lower - $1,480.00 (IN STOCK)

*You will need send your USC lower in order to use your semi auto internals

    


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


 

Upcoming Projects for the USC

1- US made upper receiver

2- Tab to lock folding stock to upper receiver

 


HK UMP - USC RAILS

Mil. Specs Picatinny Rails

See the differences, double click for bigger image

Also, check on Parts section more photos of our new improve top rail for UMP/USC

           

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 - $ 120.00 (in stock again!!)

 


 

 

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!!


 

USC  HDPS 16" Barrel $300(IN STOCK)


 

HDPS UMP barrel 7.87" in Stainless Steel in Black only- $285 (IN STOCK) 

and

Hk NEW German USC barrel on 7.87" threaded 16X1 RH or LH - $ 495 (IN STOCK)

 


NEW     NEW     NEW     NEW     NEW     NEW     NEW     NEW

UMP HDPS 7.87" Barrel $325  (IN STOCK)  Stainless Steel  HK UMP or SBR USC Threaded M16X1 LH barrel

  


 

USMP HDPS 16" with UMP flange $310 (OUT OF 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.

 

 

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.

 


ATTENTION, most of the new production of  HK UMP folding stocks are out of  their own factory specifications, date code is  - AI  and forward.

 

 If you have one of those I am able now  to "fix" those folding stocks

 

You can see in the PICs the difference

  Real UMP Carbine with stock on left, Bad stock on right

  Good UMP  stock on left, Bad stock on right

    Bad UMP stock against real UMP carbine

Bad UMP stock against stock block B

 date code on new production stock


 

 

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 and old early SL8-1, they will not work in the USC/UMP unless the relieve is made.

 

     


This photo was given to me by the BATFE Firearms Technology Branch

ATTENTION, If you are purchasing a second hand USC, make sure that the upper receiver was not milled out in order to fire in full auto like in the above photo. The receiver itself will be considered an illegal machine gun.

Before sending any USC upper receiver to HDPS CORP. for services make sure it is not illegal, in the case I receive an illegal machine gun upper receiver  I will be required to render it to BATFE.


Disclaimer

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.

 

 

 

 

Copyrightę2003-2014 "HOMELAND DEFENSE AND POLICE SUPPLY CORP."  - All Rights Reserved
No reproductions of pictures or materials are authorized in whole or in part in any form.