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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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 USP .45 ACP Barrel - Threaded 16x1 LH
RCM
$270.00RCM HK USP .45 ACP Barrel - Threaded 16x1 LH HK USP .45 ACP & HK USP Tactical .45 ACP threaded barrel for use with a wide variety of flash hiders & sound suppressors. This is a special offering as a factory USP Tactical.45 ACP barrel is threaded...HKP-20130$270.00 -
RCM MP5K/SP89/SP5K 9mm RS Trunnion
RCM
$69.95MP5K Reverse Stretch Trunnion US-made to exact factory HK specifications for the HK MP5K, SP89 9mm builds. There is a difference between the MP5K and the MP5 trunnion. This offering is the correct trunnion for the MP5K and all MP5K PDW variants,...HKP-02242$69.95 -
H&K Mark 23 .45 ACP Barrel - Threaded 16x1 RH
H&K Heckler & Koch
$599.95H&K Mark 23 .45 ACP Barrel - Threaded 16x1 RH A great replacement item for a now out-of-production pistol. New HK German mark 23 barrel threaded with the factory correct 16x1 RH thread. Get that replacement or factory new spare barrel while they are...HKP-01038$599.95 -
HK 416 10.4" Upper Gas Block - German
$279.95HK German 10.4" Upper Gas Block Complete New HK German manufacture. This is the ONLY 10.4" gas block available from HK Germany. Compatible With: HK 416 10.4" uppers HK MR556 to 10.4" conversions Please Note: This unit is NOT a vented gas block.HKP-01543$279.95 -
$79.95 -
Out Of Stock
HKP MP5SD 9mm Barrel - Threaded 18x1
HKP HK Parts
$169.95HKP MP5SD 9mm Barrel - Threaded 18x1 Made in the USA from 416 stainless steel, this high-quality barrel undergoes the highly desirable nitride process for a super hard, durable finish. Precision milled to the latest specifications, it features...HKP-17755$169.95 -
Omega HK UMP .45 ACP Barrel - 3-Lug
OMEGA
$449.95Omega HK UMP .45 ACP Barrel - 3-Lug This is the newest barrel for the UMP to hit the market that will come with a removable 3-lug adapter. The 3-lug adapter will be the same spec as the MP5 3 lug, making your UMP more versatile when it comes down to...HKP-21070$449.95 -
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 -
H&K USP 9mm Full Size Barrel - Black
H&K Heckler & Koch
$235.99H&K USP 9mm Full-Size Barrel - Black HK factory German HK cold hammer forged barrel. New date-coded and serialized barrel. Compatible With: USP 9mm USP 9mm TacticalHKP-01527$235.99 -
H&K HK 45C German Barrel
H&K Heckler & Koch
$234.95HK45C German Barrel Genuine Heckler & Koch HK45 Compact standard length, non-threaded, factory barrel. This is a great item to have as a spare.HKP-01641$234.95 -
Out Of Stock
H&K P30 9mm Tactical Barrel - Threaded 1/2x28 RH
H&K Heckler & Koch
$449.95H&K P30 9mm Tactical Barrel - Threaded 1/2x28 RH Each HK German barrel now includes a factory HK German thread protector, designed specifically for threaded P30 barrels in 1/2x28. We start with a new HK German P30L barrel, professionally fitted to...HKP-19964$449.95 -
H&K 9mm Thread Protector - Threaded 1/2x32 RH
H&K Heckler & Koch
$39.95H&K 9mm Thread Protector - Threaded 1/2x32 RH A great replacement item for lost or damaged thread protectors & caps. This part is compatible with all factory-spec MP5 Navy or MP5KN barrels. Specifications: Overall Length .610" Threaded 1/2x32...HKP-00108$39.95 -
HKP .40 S&W Tactical Texas Style Thread Protector - Threaded 14.5x1 LH
USA
$24.95HKP .40 S&W Tactical Texas Style Thread Protector - Threaded 14.5x1 LH The Texas style thread protector features raised knurling, distinguishing it from the standard HK Style with flat knurling. Made in the USA, it is designed for use with 14.5x1 LH...HKP-19907$24.95 -
RCM HK34 MP5 9mm Barrel - Non-Threaded
RCM
$264.95RCM HK34/94 MP5 9mm Barrel - Non-Threaded Each non-threaded barrel is hand-selected from the finest cold hammer forged steel (CHF) 41V45 barrel blanks. Expertly profiled and chambered in the desirable 16 flute chamber profile. Each barrel is finished...HKP-00927$264.95 -
RCM HK P30 .40 S&W Tactical Barrel - Threaded 9/16x24 RH
RCM
$225.00RCM HK P30 .40 S&W Tactical Barrel - Threaded 9/16x24 RH 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 P30 .40...HKP-16714$225.00 -
RCM HK USP 9mm Tactical Barrel - Threaded 13.5x1 LH
RCM
$225.00RCM HK USP 9mm Tactical Barrel - Threaded 13.5x1 LH 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...HKP-16706$225.00 -
H&K VP40 Tactical Barrel - Threaded 14.5x1 - TiN
H&K Heckler & Koch
$299.95H&K VP40 Tactical Barrel - Threaded14.5x1 - TiN Precision made in Germany by HK from cold hammer forged ordnance grade steel, this enhanced TiN PVD treated barrel is the finest threaded HK TiN barrel available for the HK VP40 or VP40 Tactical pistol...HKP-19598$299.95 -
On Sale
HKP HK MR556/416 Upper 8" 416C Style Conversion Kit w/ Handguard
HKP HK Parts
Now: $1,119.95Was: $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-18628Now: $1,119.95Was: $1,495.95 -
RCM MP5K/SP5K/SP89 9mm Barrel - Non-Threaded 3-Lug
RCM
$149.95RCM MP5K/SP5K/SP89 9mm Barrel - Non-Threaded 3-Lug This is the only US-made non-threaded barrel that uses the same steel and Cold Hammer Forged (CHF) process as Heckler & Koch. Precision-milled to the latest MP5KN PDW specifications with...HKP-01764$149.95 -
HKP .40 S&W Thread Protector - 9/16x24
HKP HK Parts
$19.95HKP .40 S&W Thread Protector - 9/16x24 The New Style .40 Caliber Tactical Thread Protector is an essential accessory designed to safeguard your HK .40 caliber pistol's threaded barrels. Perfectly crafted to fit all HK .40 caliber full-size and...HKP-18145$19.95 -
RCM HK VP40 .40 S&W Tactical Barrel - Threaded 14.5x1 LH
RCM
$225.00RCM HK VP40 .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 threaded replacement barrel for the HK VP40 .40 cal...HKP-17369$225.00 -
B&T TP9/MP9 Barrel Guide & Suppressor Adapter
B&T Brugger & Thomet
$419.95B&T TP9/MP9 Barrel Guide & Suppressor Adapter Swiss B&T manufactured barrel adapter assembly for the TP9 & MP9 & SSP models. Allows the user to install current B&T model suppressors on earlier modeled TP9, SSP, & MP9...HKP-17299$419.95 -
Out Of Stock
H&K Barrel VP9 - Black
H&K Heckler & Koch
$0.00H&K Barrel VP9 - Black Brand New HK German Standard Length VP9 Barrel. Marked HK 9mmx19. Brand new cold hammer forged & made in Germany. Compatible With: HK VP9 and VP9 Tactical ModelsHKP-16820$0.00 -
RCM HK P30L .40 S&W To .357 SIG Conversion Barrel - Non-Threaded
RCM
$237.50RCM HK P30L .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 threaded barrel for the HK P30L .40...HKP-17568$237.50 -
Out Of Stock
H&K VP9SK 9mm Dimpled Barrel - Threaded 13.5x1
USA
$229.95H&K VP9SK 9mm Dimpled Tactical Barrel - Threaded 13.5x1 Each barrel is meticulously crafted from ordnance grade steel, heat-treated, and finished inside and out with an ultra-desirable nitride coating. The enhanced design features a...HKP-18420$229.95 -
HKP .45 ACP Thread Protector - Threaded .578x28 RH
HKP HK Parts
$14.95HKP .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 threads...HKP-17623$14.95 -
HKP 3-Lug Adapter - Threaded 1/2x32
HKP HK Parts
$49.95HKP 3-Lug Adapter - Threaded 1/2x32 The HK 3-Lug Adapter, internally threaded with 1/2x32 threads, can easily attach to any existing 1/2x32 threaded parts. This is the finest machined adapter on the market, made in the USA to exact HK German 3-lug...HKP-00107$49.95 -
HKP MP5 40/10 Trunnion
HKP HK Parts
$139.95MP5 40 & MP5 10mm Trunnion Machined from ordnance-grade steel and heat-treated to factory specs. Each has the bullet guides pre-installed and included. These are the best USA-made trunnions on the market. Machined to HK spec, making the installation...HKP-02737$139.95 -
RCM HK Mark 23 .45 ACP Tactical Barrel - Threaded .578x28 RH
RCM
$289.95RCM HK Mark 23 .45 ACP Tactical Barrel - Threaded .578x28 RH This HK Mark 23 tactical threaded barrel designed for compatibility with various flash hiders and sound suppressors. Unlike the factory HK Mark 23 barrel with 16x1 RH threads, this barrel...HKP-17444$289.95 -
RCM HK P30L .40 S&W Tactical Barrel - Threaded 9/16x24 RH
RCM
$225.00RCM HK P30L .40 S&W Tactical Barrel - Threaded 9/16x24 RH 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 .40...HKP-16713$225.00 -
H&K HK G36C Gas Piston Rod Spring Assembly - Black
H&K Heckler & Koch
$89.95HK German G36C Gas Piston Rod & Spring Assembly - Complete 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 spare parts.HKP-00353$89.95 -
HKP .40 S&W Thread Protector - Threaded 14.5x1 LH - Titanium
HKP HK Parts
$24.95HKP HK .40 S&W Thread Protector - Threaded 14.5x1 LH - Titanium Solid Titanium .40 S&W tactical thread protector, cap fits all HK USP .40 S&W full size & compact barrels threaded 14.5x1 left hand thread. A must have item to protect your...HKP-17961$24.95 -
HKP HK MR556/416 Barrel Mandrel Tool
HKP HK Parts
$169.95HKP HK MR556/416 Barrel Mandrel Tool US Made - HK 416, MR556 Barrel Mandrel Tool.HKP-19059$169.95 -
HKP HK UMP .40 S&W Barrel - Threaded 9/16x24 - 3-Lug
HKP HK Parts
$299.95HKP HK UMP .40 S&W Barrel - Threaded 9/16x24 - 3-Lug This new USA-made .40 S&W 8" barrel is designed for UMP or Omega firearms, featuring both 9/16x24 threading and a 3-lug tip. It’s the finest barrel available for the UMP .40 S&W,...HKP-18282$299.95 -
HKP HK UMP 9mm Barrel - Threaded 1/2x28 - 3-lug
HKP HK Parts
$299.95HKP HK UMP 9mm Barrel - Threaded 1/2x28 - 3-lug HKP UMP 3-lug 1/2x28 threaded barrel. This is the perfect replacement for a worn out barrel or as a spare. With the 3-lug attachment point you can attach any suppressor or flash hider that is in-spec or you...HKP-18639$299.95 -
RCM HK Mark 23 .45 ACP Tactical Barrel - Threaded 16x1 LH
RCM
$270.00RCM HK Mark 23 .45 ACP Tactical Barrel - Threaded 16x1 LH US-made HK Mark 23 tactical threaded barrel designed for use with a wide variety of flash hiders and sound suppressors. Unlike the factory HK Mark 23 barrel with 16x1 right-hand...HKP-17443$270.00 -
RCM HK PSG1 Style Trunnion
RCM
$119.95HK PSG1 Trunnion- PTR- USA RCM trunnion for custom PSG1, MSG90, & other custom HK91/G3 type builds. Machined completely from ordnance grade 9310 enhanced steel and heat treated to exact HK specifications. This item is the best USA made trunnion on...HKP-20522$119.95 -
B&T HK MP5 9mm Barrel - Threaded 1/2x32 - 3-Lug
B&T Brugger & Thomet
$449.95B&T HK MP5 9mm Barrel - Threaded 1/2x32 - 3-Lug New from B&T Switzerland, this cold hammer-forged (CHF) and nitrided barrel is manufactured to exact HK factory specifications exclusively for MP5 models. B&T, a trusted partner of H&K...HKP-17956$449.95 -
Out Of Stock
H&K 21E/23E/21/11/13 Barrel Grip Holder - German
H&K Heckler & Koch
$34.95H&K 21E/23E/21/11/13 (7.62x51/.308) & (5.56/.223) Barrel Grip Holder - German New old stock with handling marks from being bagged and shipped in bulk. German HK manufacture. We are told these are the last units found in Germany. Last call!HKP-16427$34.95