If you have trouble making a transaction, YOU STILL CAN PURCHASE VIA PAYPAL INVOICE OR SEND USPS MONEY ORDER OR please use our paper form located here: Manual CC Form
HDPS CORP – The Home of Quality Heckler and Koch conversions services and parts since 2003, no aftermarket compromise!
ATTENTION – Be aware that HDPS CORP is the only maker of Conversion Blocks (B and C) for the Heckler and Koch USC to UMP conversion. We have received emails with problematic Blocks made and sold by other manufacturer claiming to be a Block B. MAKE SURE IT IS ENGRAVED as you see in photos to avoid fitting problems with counterfeit Block B’s
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HK 416D .22 LR Cal. NIB (With 3 Magazines)
$550.00 -
Heckler and Koch 416 – HK MR 556 A1 NIB (TEN YEARS OLD RARE early Edition with HK 416 upper)
$9,875.00 -
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
$120.00 -
UMP/USC Long Top Rail and 2 Low Profile Screws
$40.00 -
UMP/USC Short Front Rail and 2 Low Profile Screws
$30.00 -
UMP/USC Set of Rails/screws in blister pack
$125.00 -
Vertical Grip – UTG Ergonomic Ambidextrous Foregrip
$20.25 -
HK G-36 / SL8-1 / UMP .45 / USC.45 SLING by BLACKHAWK U.S.A.
$35.50

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ATI 5 Position Vertical Grip – Variable Vertical Foregrip
$29.75 -
FAB Defense Vertical Grip – 7 Position Vertically Folding Foregrip
$42.75 -
UMP HDPS 7.87″ THREADED .578×28 RH STAINLESS STEEL FINISHED IN CERAKOTE BARREL for HK UMP AND USC (Compliance Part)
$365.00 -
Heckler & Koch H&K MP5 MP-5 SD .22 Long Rifle HV Semi Auto Carbine *NEW*
$529.00 -
Heckler and Koch MP5 30 Round Magazine – Genuine Made in Germany – MP5, SP5, MP5K, SP5K, SP89
$78.95 -
UK 59 Medium Machine Gun UK Vz.59
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M240 SLR Belt Fed Semi Auto 7.62×51 NATO (New in Case)
$16,800.00 -
Heckler and Koch UMP and USC Trigger Spring
$7.75 -
Heckler and Koch UMP and USC Hammer Springs RH & LH ((N E W))
$18.50 -
AR-15 or Umarex 416 D – Carbine Faux Sound Suppressor
$150.00 -
Heckler and Koch UMP and G36 (all) Hammer NEW
$38.50 -
Heckler and Koch UMP Lower Release Lever Complete with spring and axle
$29.50
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Homeland Defense & Police Supply Corp