Caliber Conversion Kits
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HKP HK 416C 9" Complete Upper Receiver Assembly
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 -
Out Of Stock
Tommy Built HK USC Pistol Grip & Fixed Stock
Tommy Built
$449.99Tommy Built HK USC Pistol Grip & Fixed Stock This bolt-on fixed UMP style stock and pistol grip for the USC rifle is a great solutionif you can’t have a folding stock or high-cap mag and dont want to go through the expense of a full UMP...HKP-21361$449.99 -
Out Of Stock
CQT FX Simunition Conversion Kit for MP5 - 9mm - Used
Simunition
$149.95CQT FX Simunition Conversion Kit for MP5 - 9mm - Used Used in good condition. Includes: Barrel insert Locking piece Barrel muzzle clampHKP-20648$149.95 -
MM HK UMP 9mm Conversion Kit - 16 inch Barrel
Michaels Machines
$889.95HK UMP 9mm Conversion Kit - US-Made UMP/USC conversion kit will convert existing USC-UMP conversions to 9mm. This is a simple drop-in conversion for those who have already done the USC-UMP conversion. The conversion parts are drop-in, with the...HKP-02284$889.95 -
DTAC HK MP5SD Front End Kit
DTAC Dakota Tactical
$1,199.95Dakota Tactical HK MP5SD Front End Kit If you have wanted to convert that MP5 or SP5 to an SD but didn't know where to start, look no further. Our kit provides all necessary components (aside from suppressor) to do so. With a DTAC Cage and SD guard...HKP-21318$1,199.95 -
Out Of Stock
H&K 91/G3 (.22LR) Conversion Kit
H&K Heckler & Koch
$0.00Used Surplus Genuine German HK G3 .22 caliber conversion kit Fits 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 -
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 - 9mm UMP/USC conversion kit will convert existing USC-UMP conversions to 9mm. This is a simple drop-in conversion for those who have already done the USC-UMP conversion. The conversion parts are drop-in with...HKP-02286$889.95 -
H&K HK UMP .45 Conversion Kit
$1,099.95H&K HK UMP .45 Conversion Kit This kit optimizes the UMP platform by allowing the user swap between calibers in approximately 5 minutes. The Michael's machine semi-auto bolt pairs perfectly with the TPM and Gideon Shadow receivers as well as USC to...HKP-20623$1,099.95 -
Out Of Stock
H&K HK VP9 to HK VP9 Long Slide Conversion Kit - Black
H&K Heckler & Koch
$0.00H&K HK VP9 to HK VP9 Long Slide Conversion Kit - Black Compatible With: HK VP9 Features: Slide assembly with rear serrations, charging supports, and forward serrations / lightening cuts O-ring enhanced barrel, optimized and fit for...HKP-19040$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 -
HKP HK UMP (9mm) Conversion Kit - 3 Lug - Threaded Barrel 1/2x28
HKP HK Parts
$999.95HK UMP 9mm Conversersion Kit - USA - 9mm UMP/USC conversion kit will convert existing USC-UMP conversions to 9mm. This is a simple drop-in conversion for those who have already done the USC-UMP conversion. The total conversion requires approximately...HKP-02285$999.95 -
Out Of Stock
HKP HK UMP (9mm) Conversion Kit -Threaded 1/2x28
HKP HK Parts
$679.95HK UMP 9mm Conversion Kit - Threaded Barrel 1/2x28 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 in...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