Barrels
Premium HK Barrels and Firearm Parts to upgrade your HK firearm with precision-engineered, CHF (Cold Hammer Forged) barrels, and premium parts built for reliability, unparalleled accuracy, and long-term performance. Our OEM and aftermarket HK barrels deliver exceptional quality and fit for pistols, rifles, and submachine guns.
Key Features:
- CHF (Cold Hammer Forged) construction for unmatched durability and precision
- Engineered for superior accuracy and shot consistency
- Made from premium, corrosion-resistant materials
- Designed for performance, competition, and tactical applications
- OEM fit and easy installation across multiple HK platforms
Enhance your HK pistol or rifle with the best high-performance CHF barrels engineered for excellence, trusted by professionals and firearm enthusiasts.
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HK MP5K Barrel Extension and Faux Suppressor - 9mm - 3 Lug - US
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
HK91, G3 Barrel - 7.62 / .308 - 18" - Threaded 5/8x24 - Match
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 -
HK45 Thread Protector - 16x1 LH
HKP HK Parts
$19.95HKP .45 ACP Titanium Thread Protector - Threaded 16x1 LH This new style .45 ACP tactical thread protector fits all HK45 full-size and compact barrels with 16x1 LH threads. Essential for protecting your threaded barrels and exposed threads, it preserves...HKP-18004$19.95 -
HK SL8, G36 Piston Rod Assembly
H&K Heckler & Koch
$64.95Heckler and Koch Gas Piston Rod and Spring Assembly for HK G36 and HK SL8 Great for spare parts or to use on that HK SL8-G36 conversion. This is a high-wear item and a must-have spare part. Compatible With: SL8-6, SL8-1 G36 full size G36EHKP-02000$64.95 -
HK MP5, MP5K Muzzle Protector Cap - 3-Lug
H&K Heckler & Koch
$19.95H&K MP5, MP5K Muzzle Protector Cap - 3-Lug New HK German high-impact polymer muzzle protector, sealing cap. Simply slide the barrel cap over the exposed HK MP5, MP5K 3-lug barrel and remove when needed. A must have for sealing the muzzle end of the...HKP-17666$19.95 -
HK416, MR556 Barrel - 5.56 - 10.4" - Threaded 1/2"x28 - A3
Nefarious Arms
$594.95Nefarious Arms HK 416/MR556 10.4" A3 Barrel ***THE BARREL EXTENSION RIM IS MARKED "HAUS" DUE TO AN ERROR BY THE BARREL EXTENSION SUPPLIER. THE MARKING IS NOT VISIBLE ONCE INSTALLED. THESE BARRELS ARE GENUINE NEFARIOUS BARRELS AS NEFARIOUS...HKP-21335$594.95 -
HK416 Gas Block Assembly Tool
Nefarious Arms
$94.95Nefarious Arms HK 416 Gas Block Assembly Tool A Nefarious Arms creation for those that like to service or replace their 416 gas block. This assembly tool will effortlessly help you assemble or disassemble your 416 gas block by simply aligning the two...HKP-21273$94.95 -
HK MR556 A4 Gas Block - Complete
H&K Heckler & Koch
$237.95H&K HK MR556 A4 Gas Block - Complete Factory HK MR556 A4 adjustable gas block ideal for switching between suppressed and unsuppressed firing. Compatible With: HK MR556 A4 Nefarious Arms A5 barrels NOT compatible with MR556 A1 without...HKP-21928$237.95 -
Out Of Stock
HK VP40 Conversion Barrel - .40 S&W to 9mm - Threaded - 1/2x28
RCM
$214.95RCM HK VP40 to 9mm Conversion Barrel - Threaded - 1/2x28 This 9mm conversion barrel is a drop-in replacement that allows your VP40 to shoot the popular 9mm cartridge. It has the standard 1/2x28 thread and comes with a thread protector. Each...HKP-21676$214.95 -
Out Of Stock
HK G36C Gas Piston Rod and Spring
H&K Heckler & Koch
$89.95Heckler and Koch Complete Gas Piston Rod and Spring Assembly for HK G36C A must-have item for HK G36C conversions from G36 to SL8's or for spares for your G36C. New HK German factory OEM part. A high wear and replacement part and a must-have for...HKP-00353$89.95 -
HK21, HK21E, HK23E, HK11A1 Barrel Handle
Michaels Machines
$74.95HK 21, 21E, 23E, HK11 Barrel Handle US-made barrel handle. A great alternative for the original barrel handles that are no longer in production. Available in black or OD green and compatible with 5.56 and .308 platforms. Compatible...HKP-00244-M$74.95 -
HK91, G3 Barrel - 7.62x51 - 17.7" - Threaded 5/8x24
RCM
$264.99RCM HK G3/91 Threaded Barrel - 5/8x24-CHE Machined by RCM from a Mil-Spec 41V50 Hammer Forged Blank. These blanks are considered to be one of the finest made. 1:10 twist, Nitride finish. Perfect for that HK build or to replace that shot out barrel. Each...HKP-21838$264.99