10mm

RCM HK STYLE MP5 10mm, 9/16-24 THREAD
10mm, HK SMG
$280⁰⁰
MP5 10mm 3-Lug & Threaded – 9/16-24 NEW RCM CHF MP5 10mm BARREL. This is the finest US made barrel available. Material is CHF 41v40. Machined to the highest standards. Correct Chamber Flutes unlike other U.S. made barrels that don't have any flutes. Proper feed ramp and Timed Extractor Cut. Nitride inside and out for corrosion and wear. Comes with the Thread Protector. You will not find a better barrel PERIOD
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RCM HK STYLE MP5 10mm, 14X .75mm THREAD
10mm, HK SMG
$280⁰⁰
MP5 10mm 3-Lug & Threaded – 14x.75mm NEW RCM CHF MP5 10mm BARREL. This is the finest US made barrel available. Material is CHF 41v40. Machined to the highest standards. Correct Chamber Flutes unlike other U.S. made barrels that don't have any flutes. Proper feed ramp and Timed Extractor Cut. Nitride inside and out for corrosion and wear. Comes with the Thread Protector. You will not find a better barrel PERIOD
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RCM HK STYLE MP5K 10mm, 9/16-24 THREAD
10mm, HK SMG
$280⁰⁰
MP5k 10mm 3-Lug & Threaded – 9/16-24 NEW RCM CHF MP5K 10mm BARREL. This is the finest US made barrel available. Material is CHF 41v40. Machined to the highest standards. Correct Chamber Flutes unlike other U.S. made barrels that don't have any flutes. Proper feed ramp and Timed Extractor Cut. Nitride inside and out for corrosion and wear. Comes with the Thread Protector. You will not find a better barrel PERIOD
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RCM HK STYLE MP5K 10mm, 14x.75mm THREAD
10mm, HK SMG
$280⁰⁰
MP5k 10mm 3-Lug & Threaded – 14x.75mm NEW RCM CHF MP5K 10mm BARREL. This is the finest US made barrel available. Material is CHF 41v40. Machined to the highest standards. Correct Chamber Flutes unlike other U.S. made barrels that don't have any flutes. Proper feed ramp and Timed Extractor Cut. Nitride inside and out for corrosion and wear. Comes with the Thread Protector. You will not find a better barrel PERIOD
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RCM HK STYLE TRUNION .40 CAL
10mm, 40S&W, HK SMG
$130⁰⁰
MP5 40, MP5 10mm Trunion Made to exact factory HK specifications for the HK MP5, 40/10mm trunion type builds. Machined completely from ordnance grade steel and heat treated to factory specs. Each has the bullet guides pre installed the correct way like brand X that fall out. These are the best made trunions on the market. Machined to HK spec making the install painless and hassle free. The way a custom HK build it should be!
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RCM HK STYLE MP5 .40 F/A BOLT GROUP
10mm, 40S&W, HK SMG
$415⁰⁰
Ideal to replace out of spec, worn or broken bolt groups or for that custom build. Each bolt group will work and fit on semi or full auto MP5 40 & 10mm style firearms. This is the finest US BCG available. Each bolt group comes complete, assembled ready to go:

Bolt head complete

#24 LO locking piece

Firing pin

Firing pin spring

Full auto bolt carrier (works in semi and F/A)

Recoil assembly

All parts use ordnance grade steel, heat treated to HK factory specifications. As an added bonus each bolt group counts as 2 US made compliant parts. This is simply the finest bolt group made. Made right here in the USA with all of the latest upgrades, material & improvements.
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RCM HK STYLE MP5 PDW/K .40 F/A BOLT GROUP
10mm, 40S&W, HK SMG
$415⁰⁰
Ideal to replace out of spec, worn or broken bolt groups or for that custom build. Each bolt group will work and fit on semi or full auto MP5K 40 & MP5K style 10mm firearms. This is the finest US BCG available. Each bolt group comes complete, assembled ready to go:

Bolt head complete

#24 LO locking piece

Firing pin

Firing pin spring

Full auto bolt carrier (works in semi and F/A)

All parts use ordnance grade steel, heat treated to HK factory specifications. As an added bonus each bolt group counts as 2 US made compliant parts. This is simply the finest bolt group made. Made right here in the USA with all of the latest upgrades, material & improvements.
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RCM HK STYLE MP5 .40 CAL F/A BOLT CARRIER
10mm, 40S&W, HK SMG
$158⁰⁰
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RCM HK STYLE MP5 .40 PDW/K BOLT CARRIER
10mm, 40S&W, HK SMG
$158⁰⁰
Machined completely from billet ordnance steel. This carrier is made to the latest specs and is Tungsten filled, and heat treated providing the finest American made carrier available. 100% Satisfaction Guaranteed. Not to be confused with cheap imitations being sold by others! These are in the black oxide finish, all hardware installed.
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RCM HK STYLE .40 CAL BOLT HEAD ASSEMBLY
10mm, 40S&W, HK SMG
$212⁰⁰
HK MP5 40/10 Bolt Head Complete
The RCM Hk Style .40 Bolt Head is the real deal for when its time to replace your out of spec, worn or broken bolt heads or for that custom build. Each bolt head will work and fit on semi or full auto MP5 40,10mm pistol or rifles. Each bolt head is made from ordnance grade steel. Machined and Heat Treated to exact HK Specs.
This offering is the finest US made bolt head available. Each Bolt head comes complete and assembled ready to go:
Extractor US
Extractor spring US
Roller retainer spring German HK
Pair of 8mm standard MP5 40/10 rollers US
Roller retainer pin US
As an added bonus each bolt head counts as 1 US Compliant part. This is simply the finest bolt head HK or otherwise for the money. Made right here in the USA with all of the latest upgrades, material & improvements
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RCM HK STYLE 40 CAL. EXTRACTOR
10mm, 40S&W, HK SMG
$40⁰⁰
Made to to highest standards, this HK style this MP5 40/10/.357 1.4mm Extractor is made from a solid billet of an enhanced steel for superior function & durability. Each extractor has been made to the current HK German Specs & polished face for increased reliability. Perfect to get that out of spec clone or worn out HK bolt working as it should. These are simply the finest US made extractors available. A great upgrade for the clone CA and Vector builds.

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RCM HK STYLE MP5 40 CAL LOCKING PIECE HI IMPULSE #25
10mm, 40S&W, HK SMG
$50⁰⁰
MP5 40 & MP5 10mm High Impulse Locking Piece Marked #25 Made from an enhanced material and heat treated to factory specifications. Each MP5 40/10 60 Degree Locking Piece Is Used For High Impulse Ammo Commonly Found In +P Or +P+ Ammo. Each Locking Piece Is Needed To Cycle These Hot Loads Without Excessive Recoil Or Impulse That Can Cause &quot Receiver Dimpling&quot Or Damage From Too Much Energy During Cycling. When Using Hot Loads The #25 Locking Piece Should Be Used. The Low # 24 Locking Piece Should Be Used For Standard Loads With Low To Average Impulses. This Is A Must Have For All Owners That Have An MP5 40 or 10mm Firearm. Fits MP5 Variants:

MP5 .40

MP5 10mm
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HK MP5 40/10 Bolt Head Complete