HK Rifle / SMG Parts
Elevate Your HK Rifle with Premium Parts – MP5, HK416, SP5, and More!
Enhance your HK rifle with top-notch parts and accessories. From HK MP5 and HK MP5K to HK SP5 and HK UMP or HK USC, we offer a vast selection. Discover high-quality magazines, binary triggers, stocks, grips, barrels, handguards, sights, and more for your firearm. Whether you own an HK416, HK SP5K, HK G36, or HK MP5 22, we have the Heckler and Koch rifle parts you've been looking for. Shop now to upgrade your rifle to perfection.
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Out Of Stock
HK UMP Barrel - 9mm - Standard
HKP HK Parts
$299.95HK UMP 9mm Barrel US made replica of the HK UMP 9mm barrel. Counts as one US made compliant part as an added bonus.HKP-18640$299.95 -
Out Of Stock
HK UMP Bolt Group - Semi Auto - 9mm
HKP HK Parts
$369.95HK UMP 9mm -Semi-Auto Bolt Group The semi-auto bolt group is required for HK USC to HK UMP caliber conversions. The full-auto bolt carrier will not work in HK USC rifles. Includes: ExtractorHKP-18752$369.95 -
Out Of Stock
HK UMP Paddle Magazine Release
USA
$9.95US Made Paddle Magazine Release for HK UMP New UMP Mag release. This is a very common repair and replacement part as they are fairly easy to break on the UMP lower. Simple and easy to install no...HKP-18773$9.95 -
Out Of Stock
HK UMP Conversion Kit - 9mm - Threaded 1/2x28
HKP HK Parts
$679.95HKP HK UMP 9mm Conversion Kit -Threaded 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...HKP-02287$679.95 -
Out Of Stock
HK UMP Lower - Burst 4 Position 0,1,2,Full
H&K Heckler & Koch
$0.00New HK German 4 Position (0,1,2,Full) Burst LowerFits All HK UMP's. This item can be adapted for use on the USC-UMP Conversion if the F/A internals are removed & the USC (semi-auto) internals are...HKP-00593$0.00 -
Out Of Stock
HK UMP, USC Ejector Lever
$34.95HK UMP, USC Ejector Lever A great spare to have on hand as they are prone to shearing off with use and must be replaced. Perfect for the Omega and Tommy Built Tactical builds. Compatible With:HKP-18508$34.95 -
Out Of Stock
HK USC Magazine Body - .45 ACP - 10 Round - Straight - Factory
H&K Heckler & Koch
$0.00HK USC .45 10 Round Magazine Body. This is the only magazine body that HK offers for the HK USC. Compatible With: HK USC CarbinesHKP-16370$0.00 -
Out Of Stock
HK21 Trunnion
H&K Heckler & Koch
$0.00US Made HK21 Trunnion By Michael's Machine (MM) These are the finest US-made trunnions available.HKP-00246$0.00 -
Out Of Stock
HK23E Extractor Spring
H&K Heckler & Koch
$0.00HK23E Factory German Extractor Spring Rare and hard to find. This is a new HK German part.HKP-00819$0.00 -
Out Of Stock
HK11, HK13, HK21E, HK23E Vertical Foregrip - Assault
H&K Heckler & Koch
$0.00New HK German Assault Grip This vertical grip mounts directly to the front shroud and can be mounted at several angles depending on the shooter's option. This item is no longer available or in...HKP-00574$0.00 -
Out Of Stock
HK21E Feed Mechanism - Incomplete
H&K Heckler & Koch
$0.00HK21E Partial Feed Mechanism. Comes complete minus the top shelf & pin as shown. New HK date coded complete & German. We have been told these are the last units available.HKP-01019$0.00 -
Out Of Stock
HK21E, HK23E Extractor Cylindrical Pin
H&K Heckler & Koch
$0.00HK 21E, HK 23E Extractor Cylindrical Pin This part holds the extractor in place on the bolt head. A great spare to have on hand.HKP-00863$0.00