Barrels
Discover premium HK barrels and parts for your firearms. Our bestselling selection includes replacement barrels, custom barrels, precision barrels, and tactical barrels, all crafted to meet the highest standards. Whether you need stainless steel barrels, threaded barrels, pistol barrels, rifle barrels, or submachine gun barrels, we have the ideal upgrade for you. Enhance your HK rifle or pistol with high-performance, aftermarket, and competition barrels. Shop now for OEM barrels and accessories to elevate your shooting experience with unparalleled quality and reliability.
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H&K USP 9mm Standard Threaded Barrel- Threaded 13.5x1 LH
H&K Heckler & Koch
$320.95H&K USP 9mm Standard Threaded Barrel - Threaded 13.5x1 LH This Heckler & Koch factory threaded barrel is a drop-in replacement for USP 9mm SD models. It can also be used on standard USP 9mm full-size models, but the O-ring should be removed for...HKP-17809$320.95 -
Out Of Stock
RCM HK USP 9mm Tactical Barrel - Threaded 1/2x28
RCM
$225.00RCM HK USP 9mm Tactical Barrel - Threaded 1/2x28 Each barrel is finely and painstakingly made from ordnance grade steel, heat treated and finished inside and out in the ultra-desirable nitride finish. This is the finest replacement barrel available for...HKP-16705$225.00 -
RCM HK USPC .45 ACP Barrel - Threaded .578x28 RH
RCM
$270.00RCM HK USPC .45 ACP Barrel - Threaded .578x28 RH This HK USPC .45 ACP & USPC Tactical .45 ACP threaded barrel is designed for use with various flash hiders and sound suppressors. It features the common US .578x28 right-hand threads, ensuring...HKP-17448$270.00 -
B&T HK MP5 9mm Barrel - Threaded 1/2x28 - 3-Lug
B&T Brugger & Thomet
$378.95B&T HK MP5 9mm Barrel - Threaded 1/2x28 - 3-Lug New from B&T Switzerland, these MP5 barrels are cold hammer forged, fluted, and nitrided to exact HK specifications. B&T's close relationship with H&K and extensive history of...HKP-17955$378.95 -
HKP HK45 .45 ACP Thread Protector - Threaded .578x28 RH
HKP HK Parts
$19.95HKP HK45 .45 ACP Thread Protector - Threaded .578x28 RH The new US-made .45 ACP tactical thread protector, the cap fits all HK45 full size & compact barrels threaded .578x28 RH thread. A must have item to protect your threaded barrels & exposed...HKP-19514$19.95 -
RCM HK USPC 9mm Tactical Barrel - Threaded 13.5x1 LH
RCM
$225.00RCM HK USPC 9mm Tactical Barrel - Threaded 13.5x1 LH Each USPC tactical barrel is crafted from ordnance-grade steel, heat-treated, and finished with a durable nitride coating. This is the finest threaded replacement barrel for the HK USP Compact 9mm...HKP-01706$225.00 -
GSG9 HK G36C Gas Piston Rod Spring Assembly - Black
GSG9
$82.95HK German G36C Gas Piston Rod & Spring Assembly Complete A must have item for HK G36C conversions from SL8's or for spares for your G36C MG. A high wear and replacement part and a must have for spare parts.HKP-18250$82.95 -
Out Of Stock
RCM HK P30 9mm Barrel - Threaded 1/2x28 RH
RCM
$225.00RCM HK P30 9mm Barrel - Threaded 1/2x28 RH Each barrel is finely and painstakingly made from ordnance grade steel, heat treated and finished inside and out in the ultra- desirable nitride finish. This is the finest threaded replacement barrel available...HKP-20824$225.00 -
RCM HK USPC .40 S&W Tactical Barrel - Threaded 14.5x1 LH
RCM
$225.00RCM HK USPC .40 S&W Tactical Barrel - Threaded 14.5x1 LH Each USPC .40 S&W tactical barrel is meticulously crafted from ordnance-grade steel, heat-treated, and finished with a durable nitride coating. This is the finest threaded replacement...HKP-16708$225.00 -
RCM HK VP9L 9mm Tactical Barrel - Threaded 13.5x1 LH
RCM
$262.50RCM HK VP9L 9mm Tactical Barrel - Threaded 13.5x1 LH Each barrel is meticulously crafted from ordnance-grade steel, heat-treated, and finished with a durable nitride coating. This is the finest threaded replacement barrel for the HK VP9L 9mm...HKP-19202$262.50 -
RCM HK21 & HK11 Trunnion
RCM
$274.95RCM HK21 Trunnion When RCM set out to make a replacement trunnion for the venerable HK21, they started the process by putting a factory unit through rigorous destructive metal testing. The end-product: a US-made trunnion blending the proper...HKP-21609$274.95 -
RCM HK 45C .45 ACP Tactical Barrel -Threaded .578x28 RH
RCM
$270.00RCM HK 45C .45 ACP Tactical Barrel -Threaded .578x28 RH This HK45C & HK45C Tactical threaded barrel is designed for compatibility with a wide range of flash hiders and sound suppressors. Unlike the factory HK45C Tactical barrel with 16x1 LH...HKP-17449$270.00 -
H&K HK G36/SL8/MP7 Gas Block Pin
H&K Heckler & Koch
$8.95H&K HK G36/SL8/MP7 Gas Block Pin The G36/SL8/MP7 gas block pin is the largest out of HK's line up (UMP/USC, 415/MR556, 417/MR762).HKP-16727$8.95 -
RCM HK VP40 .40 S&W To .357 SIG Conversion Barrel - Non-Threaded
RCM
$237.50RCM HK VP40 .40 S&W To .357 SIG Conversion Barrel - Non-Threaded Each barrel is meticulously crafted from ordnance-grade steel, heat-treated, and finished with a durable nitride coating. This is the finest barrel for the HK VP40...HKP-17373$237.50 -
GSG9 HK G36C/G36K Gas Piston
GSG9
$74.95HK G36C & G36K Gas Piston Complete - USA New USA manufactured G36C & G36K gas piston complete with 3 X gas piston sealing rings installed. All stainless steel construction with the durable nitride finish. A great spare or replacement part. This...HKP-18253$74.95 -
PTR HK 91/G3/PTR-91 (7.62x51/.308) GI-K Barrel - Threaded 5/8x24 RH
PTR
$190.99PTR HK 91/G3/PTR-91 (7.62x51/.308) GI-K Barrel - Threaded 5/8x24 RH PTR/91 US made G.I. specification 16.25" barrel Trheaded 5/8 x 24. You get to use standard G3, HK91 forearms and cocking tubes with the shortness of a 16" barrel. This is the perfect...HKP-16632$190.99 -
Out Of Stock
RCM HK P30SK & P2000SK 9mm Barrel - Threaded 13.5x1 LH
RCM
$225.00RCM HK P30SK & P2000SK 9mm Barrel - Threaded 13.5x1 LH Each HK P2000SK & P30SK tactical barrel is finely and painstakingly made from ordnance grade steel, heat-treated, and finished inside and out in the ultra-desirable nitride finish...HKP-19307$225.00 -
RCM HK P30L 9mm Tactical Barrel - Threaded 13.5x1 LH
RCM
$225.00RCM HK P30L 9mm Tactical Barrel - Threaded 13.5x1 LH Each barrel is meticulously crafted from ordnance-grade steel, heat-treated, and finished with a durable nitride coating. This is the finest threaded replacement barrel for the HK P30L 9mm pistol,...HKP-16258$225.00 -
RCM HK USP .40 S&W To .357 SIG Conversion Barrel - Non-Threaded
RCM
$237.50RCM HK USP .40 S&W To .357 SIG Conversion Barrel - Non-Threaded Each barrel is finely and painstakingly made from ordnance grade steel, heat treated, with a nitrided finish inside and out. This is the finest replacement barrel available for the HK...HKP-17746$237.50 -
H&K HK 416 10.4" Vented Upper Gas Block
H&K Heckler & Koch
$279.95HK German 10.4" Upper Gas Block Complete New Vented Style New HK German manufacture newest "VENTED" version direct from HK Germany. Great upgrade part for existing 10.4" uppers that have the older style non-vented gas block or to use on the MR556-HK 416...HKP-18056$279.95 -
H&K USPC .45 ACP Barrel - Threaded 16x1 LH
H&K Heckler & Koch
$345.95H&K USPC .45 ACP Barrel - Threaded 16x1 LH This H&K USPC .45 ACP barrel features a threaded 16x1 LH design, ideal for enhancing your firearm. Made from cold hammer-forged steel with polygonal rifling, it ensures durability and precision. The...HKP-00320$345.95 -
H&K G3/91 Trunnion- Used
H&K Heckler & Koch
$39.95HK German HK G3 & HK 91 Trunnion - Used These trunnions are from demilled G3 parts kits and will have leftover receivers and barrel stubs installed along with factory barrel pins. Please note the picture shows one with the demilled parts removed...HKP-00718$39.95 -
HKP MP5K 9mm Trunnion
HKP HK Parts
$57.95HK MP5K Trunnion - USA US made to exact factory HK specifications for the HK MP5K type builds. Machined completely from ordnance grade steel and heat treated to factory specs. These are the best USA made trunnions on the market. Machined to HK spec...HKP-17964$57.95 -
PTR HK G3/91 (7.62x51/.308) Match Barrel - Threaded 5/8x24
PTR
$229.95PTR HK G3/91 (7.62x51/.308) Match Barrel - Threaded 5/8x24 This new PTR-91 US-manufactured 18" heavy profile match grade barrel is perfect for new builds and counts as one US-made compliant part. It features the proper fluted chambers for HK G3/91 rifles...HKP-19633$229.95 -
Out Of Stock
PTR HK G3/91 (7.62x51/.308) GI Barrel - Threaded 5/8x24
PTR
$214.95PTR HK G3/91 (7.62x51/.308) GI Barrel - Threaded 5/8x24 New PTR91 US made G.I. spec 18" barrel. Perfect for any barrel threaded 5/8x24. New production perfect for new builds. This part counts as one US made compliant part. Specifications: Overall Lenght...HKP-18435$214.95 -
H&K HK P2000 .357 Barrel - Black
H&K Heckler & Koch
$329.95HK P2000 .357 Barrel - Black This is a great spare or replacement barrel to have on hand. This is a popular barrel to convert the P2000 .40 to .357.HKP-01419$329.95 -
RCM HK USP .40 S&W Tactical Barrel - Threaded 14.5x1 LH
RCM
$225.00RCM HK USP .40 S&W Tactical Barrel - Threaded 14.5x1 LH Each barrel is meticulously crafted from ordnance-grade steel, heat-treated, and finished with a durable nitride coating. This is the finest replacement barrel for the HK USP full-size .40...HKP-17745$225.00 -
RCM HK Mark 23 .45 ACP Flush Fit Barrel - Non-Threaded
RCM
$270.00RCM HK Mark 23 .45 ACP Flush Fit Barrel - Non-Threaded This custom-made barrel is expertly crafted from ordnance-grade steel, heat-treated, and finished with a highly desirable nitride coating. Designed specifically for the HK Mark 23 .45 pistol, it...HKP-17622$270.00 -
RCM HK USP .40 S&W Tactical Barrel - Threaded 9/16x24
RCM
$225.00RCM HK USP .40 S&W Tactical Barrel - Threaded 9/16x24 Each barrel is meticulously crafted from ordnance-grade steel, heat-treated, and finished with a durable nitride coating. This is the best replacement barrel for the HK USP full-size .40 S&W...HKP-17744$225.00 -
HKP HK MR556/416 Barrel Nut
HKP HK Parts
$39.95HK MR556, HK 416 Barrel Nut Or Socket For Barrel - Aluminum A must have repair and replacement part for removal or when you have any work done to your barrel as the barrel nut may become damaged in the removal and installation processes. Made in the USA...HKP-17273$39.95 -
H&K HK G36 15.4" CQB Barrel Assembly - Black
H&K Heckler & Koch
$1,095.95Factory German HK G36 CQB Barrel Assembly - New Brand new HK German cold hammer forged barrel assembly, date coded, uninstalled & unfired in the factory wax paper wrapping. This is a one time offering never to be available again. Each barrel assembly...HKP-17026$1,095.95 -
HK G36, HK SL8, HK 416, HK MR556 Gas Piston - Black
USA
$79.95HK G36, HK SL8, HK 416, & HK MR556 Gas Piston - Black Complete assembly with 3X rings installed and nitrided black. Counts as one US-made compliant part for your SL8-G36 style conversion. This is one of the best parts to use on the conversion as it...HKP-14540$79.95 -
RCM HK 51 (7.62x51/.308) Barrel - Threaded 15x1 RH
RCM
$164.95RCM HK 51 (7.62x51/.308) Barrel - Threaded 15x1 RH Crafted to precise HK51 specifications, this barrel utilizes HK's renowned cold hammer forged (CHF) process. Features include a knurled sight ring, splined design for secure flash hider attachment, and a...HKP-02391$164.95 -
Out Of Stock
RCM HK21 & HK11 Barrel - 14.5"
RCM
$674.95RCM HK21 & HK11 Barrel - 14.5" RCM HK11 barrels are expertly crafted from mil-spec 41V50 CHF blanks and are fully salt bath nitrided, delivering exceptional wear and corrosion resistance. These hybrid barrels feature an E cut barrel face and are...HKP-21631$674.95 -
HKP HK G36C Barrel Front End Kit
HKP HK Parts
$889.95G36C Barrel Front End Barrel Kit - 223/556 New production HK G36C style barrel conversion kit and front end kit. Each kit will include the necessary parts to build a G38/SL8 variant into the G36KC barrel length variant as pictured. All you need is this...HKP-18228$889.95 -
RCM HK USPC .40 S&W Tactical Barrel - Threaded 9/16x24 RH
RCM
$225.00RCM HK USPC .40 S&W Tactical Barrel - Threaded 9/16x24 RH Each USPC .40 S&W tactical barrel is meticulously crafted from ordnance grade steel, heat-treated, and finished with a durable nitride coating. This is the finest threaded replacement...HKP-16707$225.00 -
H&K HK MR762/417 Gas Block Pin
H&K Heckler & Koch
$7.95H&K HK MR762/417 Gas Block Pin This is the retaining pin for an HK MR762 gas block. A must have as HK says you have to use new pins once they are removed.HKP-16596$7.95 -
HKP MP5K 9mm Fake Suppressor/Barrel Extension - 3-Lug
HKP HK Parts
$59.95HKP MP5K 9mm Fake Suppressor/Barrel Extension - 3-Lug MP5K 3-Lug Barrel Barrel Extension, Fake Suppressor US made MP5K solid aluminum fake suppressor, barrel extension. Slips over the 3-lug MP5K PDW barrel and then pinned in place to meet the overall 16"...HKP-18001$59.95 -
Out Of Stock
H&K HK USP .45 ACP Full Size Standard Length Barrel - Black
H&K Heckler & Koch
$379.95HK USP .45 ACP Full Size Standard Length Barrel - Black This part can be a replacement barrel for the USP Tactical if you do not want to have the threaded barrel installed. Easy drop-in installation. It can also be used to convert the USP Tactical .45 to...HKP-01520$379.95 -
Out Of Stock
RCM HK P30SK & HK P2000SK 9mm Tactical Barrel - Threaded 1/2x28 RH
RCM
$225.00RCM HK P30SK & HK P2000SK 9mm Tactical Barrel - Threaded 1/2x28 RH Each HK P2000SK and P30SK tactical barrel is meticulously crafted from ordnance grade steel, heat treated, and finished with a durable nitride coating. This is the finest...HKP-19306$225.00