Conversion Kits
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Out Of Stock
HKP HK 91 Polymer To Metal Trigger Group Conversion Kit
HKP HK Parts
$199.95HK 91/PTR 91 Polymer To Metal Trigger Group Conversion Kit. This is everything you will need to convert the lower trigger group on your HK 91 from polymer to metal housing with contoured grip. Just use your existing trigger pack to complete the...HKP-17362$199.95 -
Kinetic Development Group HK USC Conversion to ACR Stock Upgrade - FDE
$459.95HK USC-UMP ACR Stock Adapter & ACR Stock Combo - BrownA new product that allows you to add the widely popular Remington ACR folding, adjustable stock to your USC-UMP conversion. Each unit comes complete with the ACR stock, hinge pin, sling mount and...HKP-19845$459.95 -
Out Of Stock
HKP HK 416C 9" Complete Upper Kit
HKP HK Parts
$2,799.95HK416C Complete Upper Kit - 9" After years trying to get these back in. We finally bring you a rare unicorn of a find. With our complete 416c upper kit all that would be needed to complete this kit would be a mil-spec lower or a STS 416c lower...HKP-21042$2,799.95 -
B&T APC9/APC45 Stock Conversion Kit
$149.95Stock Conversion Kit - APC9/APC45 Converts the Telescopic Brace into a Telescopic Stock. **B&T Stock Conversion Kit For BT-20522 Telescopic Brace (US Version) - For APC9/APC45HKP-19968$149.95 -
Out Of Stock
Streamlight H&K USP Conversion Kit
Streamlight
$24.95TLR-3 & TLR-4/TLR-4G H&K USP Full Size Conversion Kit ? Full Size USP. This kit adapts a standard TLR-3 or TLR-4 to fit a USP full size pistol.HKP-16923$24.95 -
Streamlight HK USPC Conversion Kit
Streamlight
$23.95TLR-3 & TLR-4/TLR-4G H&K USP Compact Conversion Kit for all USP Compact models. For use with a standard TLR-3 & TLR-4HKP-16922$23.95 -
B&T TP9, TP380 Stock Conversion Kit
$147.95Stock Conversion Kit - TP9, TP380Converts the Telescopic Brace into a Telescopic Stock. BT-20522/20538 for TP9, TP380.HKP-19128$147.95 -
HKP 416 10.4" 5.56 Complete Upper Kit Complete
HKP HK Parts
$2,485.95HKP 416 10.4" 5.56 Complete Upper Kit Complete Each kit includes the complete upper assembly, bolt group, tungsten buffer, & high-reliability SS recoil spring. This upper kit is a complete gas piston HK 416 style upper assembly that will drop on your...HKP-17662$2,485.95 -
HKP HK MR556/416 Upper 8" 416C Style Conversion Kit w/ Handguard
HKP HK Parts
$1,495.95MR556 & HK416 Upper Conversion Kit - 8" - HK 416C Style Finally an answer for all of those that have been wanting as close to the original HK 416C 8" barrel conversion kit for 416 or MR556. Each upgrade kit is as close as you can get to a factory HK...HKP-18628$1,495.95 -
Out Of Stock
H&K 91/G3 (.22LR) Conversion Kit
H&K Heckler & Koch
$0.00Used Surplus Genuine German HK G3 .22 caliber conversion kitFits and converts all HK91, G3 rifles to shoot the cheap and readily affordable .22 LR ammunition. Includes bolt group, barrel tube, 1 magazine, and cleaning kit and wooden green case. NO...HKP-01147$0.00 -
H&K HK 45C LEM Complete Conversion Kit
H&K Heckler & Koch
$199.95New HK German HK 45 Compact LEM Conversion Kit Complete For All HK 45 Compact PistolsUse factory installed trigger return spring for the light LEM (4.5-5.5lb) and the supplied heavy trigger return spring for the heavy LEM conversion. This LEM conversion...HKP-01037$199.95 -
HKP HK MR556/416 Upper 8" 416C Style Conversion Kit
HKP HK Parts
$1,285.95MR556 & HK416 Upper Conversion Kit - 8" - HK 416C Style Finally an answer for all of those that have been wanting as close to the original, rare unicorn of a find HK 416C 8" barrel conversion kit for 416 or MR556. Each conversion kit upper or barrel...HKP-18629$1,285.95 -
MM HK UMP (.40 S&W) Conversion Kit
Michaels Machines
$999.95HK UMP 40 Caliber Conversion Kit With this UMP Conversion kit, UMP .45 sub guns can be converted to .40 caliber. Machined bolt carriers are available for USC/UMP conversion sub guns. This is a simple drop-in conversion. The time required to change...HKP-18754$999.95 -
MM HK UMP 9mm Conversion Kit
Michaels Machines
$889.95HK UMP, USC 9mm Conversion Kit US Made 9mmUMP/USC conversion kit will convert existing USC-UMP conversions to 9mm. This is a simple drop in conversion for those that have already done the USC-UMP conversion. The conversion parts are drop in with the...HKP-02286$889.95 -
MM HK UMP 9mm Conversion Kit - 16 inch Barrel
Michaels Machines
$889.95HK UMP 9mm Conversion Kit US made 9mmUMP/USC conversion kit will convert existing USC-UMP conversions to 9mm. This is a simple drop in conversion for those that have already done the USC-UMP conversion. The conversion parts are drop in with the total...HKP-02284$889.95 -
Out Of Stock
H&K HK G36K Parts Kit for HDPS Stock Block Conversion
H&K Heckler & Koch
$0.00G36K Parts Kit Complete Less Stock Hinge SectionFinally a factory German HK G36K parts kit with the most desirable of the needed parts for an HDPS stock block conversion (see below) for the needed stock block. Tom Bostic is now offering conversion work...HKP-16514$0.00 -
H&K UMP (.40 S&W) Conversion Kit - Used
H&K Heckler & Koch
$1,087.95HK UMP .40 Caliber Conversion Kit This UMP conversion kit provides the necessary components to convert .45 sub-guns to .40 caliber. Machined bolt carriers are available for USC/UMP conversion sub-guns. This is a simple, drop-in conversion requiring a...HKP-00729$1,087.95 -
Out Of Stock
HKP HK 416/MR556 14.5 " Upper Conversion Kit, 14.5"
HKP HK Parts
$699.95MR556 & HK416 Upper Conversion Kit - 14.5"Finally an answer for all of those that have been wanting a 14.5" upper for an HK416 or MR556. This conversion kit adds an upper or a barrel option for your MR556, CR556 & HK 416's. Each upgrade kit is...HKP-17877$699.95 -
Out Of Stock
HKP HK MR556/416 9" HK416C Style Barrel Upper Conversion Kit
HKP HK Parts
$0.00MR556 & HK416 Upper Conversion Kit - 9" - HK 416C StyleFinally an answer for all of those that have been wanting as close to the origional, rare unicorn of a find HK 416C 9" barrel conversion kit for 416 or MR556. Each conversion kit upper or barrel...HKP-18401$0.00 -
Out Of Stock
HKP HK MR556/416 Upper 9" 416C Style Conversion Kit
HKP HK Parts
$899.95MR556 & HK416 Upper Conversion Kit - 9" - HK 416C StyleFinally an answer for all of those that have been wanting as close to the original, rare unicorn of a find HK 416C 9" barrel conversion kit for 416 or MR556. Each conversion kit upper or barrel...HKP-18674$899.95 -
HKP HK UMP (9mm) Conversion Kit - 3 Lug - Threaded Barrel 1/2 x 28
HKP HK Parts
$999.95HK UMP 9mm Conversion Kit - USA - 9mm UMP/USC conversion kit will convert existing USC-UMP conversions to 9mm. This is a simple drop-in conversion for those that have already done the USC-UMP conversion. The total conversion requires approximately 5...HKP-02285$999.95 -
Out Of Stock
HKP HK UMP (9mm) Conversion Kit -Threaded 1/2 x 28
HKP HK Parts
$679.95HK UMP 9mm Conversion Kit - Threaded Barrel 1/2 x 28 9mm UMP/USC conversion kit will convert existing USC-UMP conversions to 9mm. This is a simple drop-in conversion for those that have already done the USC-UMP conversion. The conversion parts are drop...HKP-02287$679.95 -
Out Of Stock
Tommy Built HK G36C .300 BLK Conversion Kit
Tommy Built
$874.95HK G36C 556/223 To .300 Blackout Caliber Conversion - USA The Tom Bostic .300 BLK conversion barrel set up is designed to drop in any G36C or Sl8 to G36C conversion and reuse your G36C op-rod/spring set, gas piston & barrel nut. Each set up comes...HKP-18268$874.95