Receivers

Chambered in 6mm ARC, this RESOLUTE Upper Group is designed to pair with any standard AR15 pattern lower group. Harness the capability of 6mm in this uniquely designed RESOLUTE 16.1'' upper. Available in different Cerakote finishes, all CMMG Upper Groups...

Designed for use with CMMG .45 ACP MkG uppers, the MkG lower group accepts Glock-pattern magazines while still delivering essential AR15 features and function like last round bolt hold open. Available in different Cerakote finishes, RESOLUTE MkGs lowers...

Expertly crafted from aircraft grade aluminum, CMMG Mk4/AR15 upper receiver assemblies come with the ZEROED Polymer Dust Cover pre-installed. Available in different Cerakote finishes, this upper receiver omits the forward assist for those looking for a...

CMMG was the first to bring a 4.6x30mm firearm to the U.S. civilian market, continuing a tradition of innovation, shooters everywhere can now build a light recoiling, flat shooting PDW (personal defense weapon) like no other. Designed to work with any...

Whether you're looking to build an AR pistol in 9mm or .40 S&W, the BANSHEE MkGs pistol lower group is the perfect place to start. Designed to accept Glock-pattern magazines this MkGs lower makes caliber swaps a snap. Simply match your MkGs lower with...

Inspired by the success of the original MkG, the MkGs lower receiver is designed to accept either 9mm or .40 S&W Glock and SGM magazines. Features include an integrated trigger guard, last round bolt hold open, oversized magazine release, flared magwell,...

It matches any of the Sharps Bros. lower receivers perfectly, and it also matches the lines of their handguards perfectly as well. This receiver is meant for .223, 5.56, 300 BLK and 6.5 Grendel calibers.  Port opening is not large enough for 450...

Designed to provide superior ballistics and less felt recoil than most pistol caliber personal defense weapons, 5.7x28mm has quickly become one of the most popular chamberings in the PDW space. With the 8'' BANSHEE upper group you can build the PDW AR15...

Designed to be a flat shooting round at medium to long ranges, 6.5 Grendel offers efficient ballistic performance native to many 6.5mm bullet designs. The upside here is that this RESOLUTE Mk4 Upper Group in 6.5 Grendel is built on the Mk4 platform and...

Explore what's possible with 6.5 Creedmoor with the 24'' ENDEAVOR Mk3 Upper Group. Dedicated to long-range performance above all else, this upper utilizes a nitride-finished 416 stainless steel barrel to better harness the potential of 6.5 Creedmoor...

Start your AR10 upper build with looks and quality like no other. The CMMG Mk3 upper receiver assembly, based on the DPMS LR308 gen1 high-pattern design, gives shooters an AR10-style platform with the widest range of compatible parts and accessories on...

Don't settle for anything less when it comes to finding the right lower for your AR10 pistol build. Since there is no official ''mil-spec'' for AR10 style firearms and components, CMMG based the Mk3 platform off the popular and widely supported DPMS Gen...

DS25 Typhoon Non-NFA Firearm Builders Kit .308 Black Anodize, DS25 7075 Billet Upper / Lower Receiver Set, 12.5 Threaded Barrel, Carbine Gas, 1:10, DS25 BCG, DS25 Buffer Tube

Lower Receiver Assembly, Mk57, Armor Black

Pair this 12.5'' 5.56mm BANSHEE upper group with the Mk4/standard AR15 lower group of your choice to create a compact AR pistol or SBR that blends maneuverability with carbine like ballistic performance. Available in different Cerakote finishes, all...

Made by Bravo Company MFG, Inc. (BCM) These Barreled Upper Receiver Groups are designed for shooting professionals with the Mil-Spec features for the demands of their duty. They are fully assembled, headspaced, and test fired.