Calguns engraved lower - Page 3 - Calguns.net
The lower receiver doesn't care what caliber you use. Nor does the marking on it mean anything. You can have it stamped .223, 5.56, 6.8, 7.62x39, multi, ...
Zombie Squad • View topic - AR-mageddon - Northern Alliance AR15 ...
Advice on AR-15 lower receiver choice - TheFiringLine Forums
Advice on AR-15 lower receiver choice The Art of the Rifle.
The SOCOM SCAR program is cancelled | The Firearm Blog