CMMG is making some interesting ARs. After the Mutant, there is this new dedicated 458 Socom AR. From Bolt to lower receiver, everything is sized for this cartridge specifically. The pounding of the buffer to the end of the tube could definitely be felt, despite whatever muzzle brake was put on.
The 458 Scoom mag looks like a 5.56 mag, but it cannot reliably hold 5.56. The feed lips are wider and will spill the cartridges when used with 5.56.



The 458 Scoom mag looks like a 5.56 mag, but it cannot reliably hold 5.56. The feed lips are wider and will spill the cartridges when used with 5.56.
