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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GSG9 UMP 9mm Barrel - Threaded 1/2x28 - 3-Lug
GSG9
$349.95GSG9 UMP (9mm) Barrel - Threaded 1/2x28 - 3-Lug This barrel is the perfect addition to your UMP conversion as it includes the 3-lug and threaded 1/2x28 end of the barrel for use with suppressors or factory HK 3-lug flash hiders. Specifications: Threaded...HKP-02281$349.95 -
H&K .45 ACP Tactical Texas Style Thread Protector - Threaded 16x1 RH
H&K Heckler & Koch
$24.95H&K .45 ACP Tactical Texas Style Thread Protector - Threaded 16x1 RH The Texas Style thread protector features raised knurling, distinguishing it from the standard HK style, which does not have this raised texture. This design ensures a secure grip...HKP-20406$24.95 -
H&K HK P2000SK .40 S&W - Barrel - Black
H&K Heckler & Koch
$239.95HK German Factory P2000SK .40 S&W Barrel Brand new HK P2000SK .40 Cal factory cold hammer forged polygonal rifled barrel. This barrel measures 3.25" and is drop-in ready. Compatible With: HK P2000SK .40 S&WHKP-01569$239.95 -
H&K HK P30, P30S 9mm Barrel - Black
H&K Heckler & Koch
$269.95New HK German P30, P30S Standard 9mm Factory Barrel Brand new factory German HK P30, P30S 9mm Standard Length Barrel - 3.85" Cold hammer Forged, date coded, and proofed barrel.HKP-01828$269.95 -
H&K HK P30L .40 Cal Barrel - Black
H&K Heckler & Koch
$234.95HK German P30L .40 S&W Factory Barrel - German HK Factory German P30L .40 Cal 4.45" barrel perfect for replacement or for that project barrel. Compatible With: HK P30L HK P30, P30S (will be extended from the slide)HKP-02411$234.95 -
H&K MR556 A4/416 A5 2.0mm Gas Vent Screw
H&K Heckler & Koch
$29.95H&K MR556 A4/416 A5 2.0mm Gas Vent Screw German 2.0mm gas vent screw for MR556 A4. Provides more venting than the factory-installed 1.3mm screw. Compatible With: HK MR556 A4 HK416 A5HKP-22051$29.95 -
On Sale
HK MP5K Trunnion - Gunsmith Special
USA
Now: $24.95Was: $54.95HK MP5K Trunnion - Gunsmith Special US made HK MP5 trunnions sold as-is. Will require work before being functional. We recommend the work be performed by a professional gunsmith. The condition will vary from part-to-part vs. the pictured unit. Compatible...HKP-99090Now: $24.95Was: $54.95 -
Out Of Stock
HKP HK MR556/416 Upper 8" 416C Style Conversion Kit
HKP HK Parts
$1,285.95MR556 & HK416 Upper Conversion Kit - 8" - HK 416C Style Finally an answer for all of those that have been wanting as close to the original, rare unicorn of a find HK 416C 8" barrel conversion kit for 416 or MR556. Each conversion kit upper or barrel...HKP-18629$1,285.95 -
HKP HK USP .45 ACP 16X1 LH Thread Protector
HKP HK Parts
$19.95HKP HK USP .45 ACP 16X1 LH Thread Protector Thread protector for 16X1 left-hand .45 ACP barrels. Compatible With: HK USP .45 & Compact HK45 & Compact HK UMP/USC Firearms with 16X1 left-hand threaded .45 ACP barrels NOT compatible...HKP-22177$19.95 -
PTR-32 (7.62x39) Barrel - 16 inch
PTR
$249.95PTR-32 (7.62x39) Barrel - 16 Inch Specifications: 16.25" overall length Chambered in 7.63x39mm Fully Fluted with 12 flutes Match grade Please Note: PTR barrels have a thicker profile, and your front sight tower must be reamed for proper...HKP-02200$249.95 -
RCM HK MP5 .40 S&W Barrel - Threaded 14x.75 - 3-Lug
RCM
$279.95RCM HK MP5 .40 S&W Barrel - Threaded 14x.75 - 3-Lug This is the ultimate US-made barrel for any new or conversion build for the MP5 .40 cal. Crafted from top-grade CHF 41v40 material, it’s machined to impeccable standards. With the correct...HKP-21582$279.95 -
RCM HK P30 .40 to 9mm Conversion Barrel - Threaded - 1/2x28
RCM
$214.95RCM HK P30 .40 to 9mm Conversion Barrel - Threaded - 1/2x28 This 9mm conversion barrel is a drop-in replacement that allows your P30 to shoot the popular 9mm cartridge. The conversion barrel features a standard 1/2x28 thread pitch and includes a...HKP-21791$214.95 -
RCM HK23E Barrel - CHF
RCM
$699.95RCM HK23E Barrel RCM HK23E light profile barrels are made from mil-spec 41V50 CHF blanks that are fully salt bath nitrided for optimal wear and corrosion resistance. These barrels are the finest out there to complete your HK23E or HK13 build. These are...HKP-21837$699.95 -
RCM HK33/93 .300 BLK 16.1 Inch Barrel - Threaded 5/8x24
RCM
$234.95NCM HK33/93 .300 BLK 16.125 Inch Barrel - Threaded 5/8x24 Each barrel was designed for use with the wildly popular AAC style quick detach muzzle breaks and cans in the 5/8x24 thread pitch. Although, this barrel is perfect for just about any .300 BLK...HKP-17392$234.95 -
H&K HK MR556 A4/A5 11" Barrel
H&K Heckler & Koch
$889.95H&K HK MR556 A4/A5 11" Barrel This 11" factory H&K MR556 A4 barrel is built for compact performance without compromising durability or accuracy. Cold hammer-forged, it’s made to Heckler & Koch’s stringent standards and is ideal...HKP-21932$889.95 -
H&K HK USP Elite .45 ACP Barrel - Black
H&K Heckler & Koch
$499.95HK USP Elite .45 ACP Barrel - Black The finest HK USP .45 barrel available and used in the HK Elite line of firearms from hand-selected barrel blanks. Compatible With: HK USP Elite .45 ACP Also fits the USP .45 Full Size & Tactical models but...HKP-01524$499.95 -
H&K MR556 A4/416 A5 1.4mm Gas Vent Screw
H&K Heckler & Koch
$29.95H&K MR556 A4/416 A5 1.4mm Gas Vent Screw German 1.4mm gas vent screw for MR556 A4. Provides more venting than the factory-installed 1.3mm screw. Compatible With: HK MR556 A4HKP-22045$29.95 -
H&K MR556 A4/416 A5 1.5mm Gas Vent Screw
H&K Heckler & Koch
$29.95H&K MR556 A4/416 A5 1.5mm Gas Vent Screw German 1.5mm gas vent screw for MR556 A4. Provides more venting than the factory-installed 1.3mm screw. Compatible With: HK MR556 A4 HK416 A5HKP-22046$29.95 -
H&K MR556 A4/416 A5 1.7mm Gas Vent Screw
H&K Heckler & Koch
$29.95H&K MR556 A4/416 A5 1.7mm Gas Vent Screw German 1.7mm gas vent screw for MR556 A4. Provides more venting than the factory-installed 1.3mm screw. Compatible With: HK MR556 A4 HK416 A5HKP-22048$29.95 -
H&K MR556 A4/416 A5 2.2mm Gas Vent Screw
H&K Heckler & Koch
$29.95H&K MR556 A4/416 A5 2.2mm Gas Vent Screw German 2.2mm gas vent screw for MR556 A4. Provides more venting than the factory-installed 1.3mm screw. Compatible With: HK MR556 A4 HK416 A5HKP-22053$29.95 -
H&K MR556 A4/416 A5 2.5mm Gas Vent Screw
H&K Heckler & Koch
$29.95H&K MR556 A4/416 A5 2.5mm Gas Vent Screw German 2.5mm gas vent screw for MR556 A4. Provides more venting than the factory-installed 1.3mm screw. Compatible With: HK MR556 A4 HK416 A5HKP-22056$29.95 -
On Sale
HK MP5 Trunnion - Gunsmith Special
USA
Now: $24.95Was: $54.95HK MP5 Trunnion - Gunsmith Special US made HK MP5 trunnions sold as-is. Will require work before being functional. We recommend the work be performed by a professional gunsmith. The condition will vary from part-to-part vs. the pictured unit. Compatible...HKP-99089Now: $24.95Was: $54.95 -
HKP .40 S&W Enhanced Titanium Thread Protector- Threaded 9/16x24 - Silver
HKP HK Parts
$24.95HKP .40 S&W Enhanced Titanium Thread Protector- Threaded 9/16x24 This solid titanium .40 S&W tactical thread protector is designed for barrels threaded 9/16x24. It’s an essential accessory for safeguarding your threaded barrel,...HKP-17976$24.95 -
HKP .40 S&W Thread Protector - Threaded 9/16x24 RH
HKP HK Parts
$14.95HKP .40 S&W Thread Protector - Threaded 9/16x24 RH The HK Parts 9/16x24 Thread Protector is specifically designed for .40 S&W handgun barrels with 9/16x24 right-hand threading, compatible with HK, Glock, Sig, SW, and more. Essential...HKP-17032$14.95 -
HKP .45 ACP - Titanium Thread Protector - Threaded 16x1 LH
H&K Heckler & Koch
$23.95HKP .45 ACP Titanium Thread Protector - Threaded 16x1 LH US-made thread protector for firearms chambered in .45 ACP threaded 16x1 left hand. Specifications: Threaded 16x1 LH Compatible With: HK UMP/USC HK45/HK45T HK45C/HK45CT HK USP 45/USPT 45 HK USPC...HKP-22036$23.95 -
Out Of Stock
HKP HK G36K Barrel
HKP HK Parts
$499.95HKP HK G36K Barrel Brand new HK G36K barrel made from 416 stainless steel and nitrided, uninstalled & unfired. The G36K barrel uses a factory German or USA spec G36K/G36C gas block. Counts as one USA made complaint part. Perfect for the SL8/G36 style...HKP-18194$499.95 -
Out Of Stock
MM HK UMP (9mm) Barrel - 16.5 Inch
Michaels Machines
$549.95MM HK UMP (9mm) Barrel - 16.5 Inch Fluted just like the factory HK barrels with 16 flutes.HKP-02282$549.95 -
PTR-32 (7.62x39) Barrel - 12.7 inch
PTR
$179.95PTR-32 (7.62x39) Barrel - 12.7 inch PTR-91 US made 12.7" barrel. Factory production perfect for new builds. Counts as one US made compliant part. Compatible With: Short length G3K cocking tubes with no modificationHKP-17404$179.95 -
RCM HK MP5K 10mm Barrel - Threaded 9/16x24
RCM
$279.95RCM HK MP5K 10mm Barrel - Threaded 9/16x24 Enhance the performance of your MP5K with the RCM HK MP5K 10mm Barrel. This barrel is precision engineered for superior accuracy and durability, making it an essential upgrade for firearm enthusiasts...HKP-21157$279.95 -
RCM HK VP40 to 9mm Conversion Barrel - Threaded - 13.5x1
RCM
$214.95RCM HK VP40 to 9mm Conversion Barrel - Threaded - 13.5x1 This 9mm conversion barrel is a drop-in replacement that allows your VP40 to shoot the popular 9mm cartridge. Comes with a thread protector. Each barrel is made from ordnance-grade steel,...HKP-21790$214.95 -
H&K HK MP5/SP5 3 Lug Barrel - New Old Stock - Rare
H&K Heckler & Koch
$987.95H&K HK MP5/SP5 3 Lug Barrel - New Old Stock - Rare Factory German date coded with H&K logo. This new old stock 3-lug threaded item is incredibly rare and in pristine condition. An absolute gem in the market. We only have a limited number...HKP-21662$987.95 -
H&K HK USP Elite 9mm Barrel - Black
H&K Heckler & Koch
$699.95HK USP Elite 9mm Barrel - BlackHKP-01760$699.95 -
H&K MP5K PDW 10mm Barrel - Threaded 9/16x24 - 3-Lug
USA
$299.95H&K MP5K PDW 10mm Barrel - Threaded 9/16x24 - 3-Lug This US-made MP5KN PDW 10mm barrel features a 9/16x24 thread pitch and a 3-lug design. It is a rare and hard-to-find barrel, with only a few available. Ideal for enhancing your MP5K PDW, this barrel...HKP-02317$299.95 -
H&K MR556 A4/416 A5 1.0mm Gas Vent Screw
H&K Heckler & Koch
$29.95H&K MR556 A4/416 A5 1.0mm Gas Vent Screw German 1.0mm gas vent screw for MR556 A4. Provides less venting than the factory-installed 1.3mm screw. Compatible With: HK MR556 A4 HK416 A5HKP-22040$29.95 -
H&K MR556 A4/416 A5 1.1mm Gas Vent Screw
H&K Heckler & Koch
$29.95H&K MR556 A4/416 A5 1.1mm Gas Vent Screw German 1.1mm gas vent screw for MR556 A4. Provides less venting than the factory-installed 1.3mm screw. Compatible With: HK MR556 A4 HK416 A5HKP-22041$29.95 -
H&K MR556 A4/416 A5 1.2mm Gas Vent Screw
H&K Heckler & Koch
$29.95H&K MR556 A4/416 A5 1.2mm Gas Vent Screw German 1.2mm gas vent screw for MR556 A4. Provides less venting than the factory-installed 1.3mm screw. Compatible With: HK MR556 A4 HK416 A5HKP-22043$29.95 -
H&K MR556 A4/416 A5 1.3mm Gas Vent Screw
H&K Heckler & Koch
$29.95H&K MR556 A4/416 A5 1.3mm Gas Vent Screw The 1.3mm gas vent screw is the standard size installed at the factory on the MR556 A4. Compatible With: HK MR556 A4HKP-22044$29.95 -
H&K MR556 A4/416 A5 1.6mm Gas Vent Screw
H&K Heckler & Koch
$29.95H&K MR556 A4/416 A5 1.6mm Gas Vent Screw German 1.6mm gas vent screw for MR556 A4. Provides more venting than the factory-installed 1.3mm screw. Compatible With: HK MR556 A4 HK416 A5HKP-22047$29.95 -
H&K MR556 A4/416 A5 2.3mm Gas Vent Screw
H&K Heckler & Koch
$29.95H&K MR556 A4/416 A5 2.3mm Gas Vent Screw German 2.3mm gas vent screw for MR556 A4. Provides more venting than the factory-installed 1.3mm screw. Compatible With: HK MR556 A4 HK416 A5HKP-22054$29.95 -
H&K MR556 A4/416 A5 2.4mm Gas Vent Screw
H&K Heckler & Koch
$29.95H&K MR556 A4/416 A5 2.4mm Gas Vent Screw German 2.4mm gas vent screw for MR556 A4. Provides more venting than the factory-installed 1.3mm screw. Compatible With: HK MR556 A4HKP-22055$29.95