CMMG

Perfect for building your custom AR15 upper group. Comes with a properly installed M4 barrel extension. All barrel sub-assemblies are properly headspaced.

Perfect for building your custom AR15 upper group. Comes with a properly installed M4 barrel extension. All barrel sub-assemblies are properly headspaced.

Perfect for building your custom AR15 upper group. Comes with a properly installed M4 barrel extension. All barrel sub-assemblies are properly headspaced. Made of 416 Stainless with an SBN Finish.

Quickly becoming a fan favorite over the last several years, 5.7x28mm has found favor with those looking for a fast, lightweight round that offers excellent penetration at short ranges with minimal...

Quickly becoming a fan favorite over the last several years, 5.7x28mm has found favor with those looking for a fast, lightweight round that offers excellent penetration at short ranges with minimal...

Quickly becoming a fan favorite over the last several years, 5.7x28mm has found favor with those looking for a fast, lightweight round that offers excellent penetration at short ranges with minimal...

Quickly becoming a fan favorite over the last several years, 5.7x28mm has found favor with those looking for a fast, lightweight round that offers excellent penetration at short ranges with minimal...

Quickly becoming a fan favorite over the last several years, 5.7x28mm has found favor with those looking for a fast, lightweight round that offers excellent penetration at short ranges with minimal...

Quickly becoming a fan favorite over the last several years, 5.7x28mm has found favor with those looking for a fast, lightweight round that offers excellent penetration at short ranges with minimal...

Quickly becoming a fan favorite over the last several years, 5.7x28mm has found favor with those looking for a fast, lightweight round that offers excellent penetration at short ranges with minimal...

The personal defense caliber SBR hunt is over. Chambered in one of the most popular PDW cartridges, 5.7x28mm, the Mk57 SBR features an 8'' barrel to better extract the full ballistic performance...

The personal defense caliber SBR hunt is over. Chambered in one of the most popular PDW cartridges, 5.7x28mm, the Mk57 SBR features an 8'' barrel to better extract the full ballistic performance...

The personal defense caliber SBR hunt is over. Chambered in one of the most popular PDW cartridges, 5.7x28mm, the Mk57 SBR features an 8'' barrel to better extract the full ballistic performance...

The personal defense caliber SBR hunt is over. Chambered in one of the most popular PDW cartridges, 5.7x28mm, the Mk57 SBR features an 8'' barrel to better extract the full ballistic performance...

The personal defense caliber SBR hunt is over. Chambered in one of the most popular PDW cartridges, 5.7x28mm, the Mk57 SBR features an 8'' barrel to better extract the full ballistic performance...