TikkaShooter
Member
The upper and lower are different. Using BG terminology, the .308 version is a long action and the 5,56 etc, are short actions.
PS:
Semantics once Armalite owned the rights until they sold them to Colt who produced an M-series. Nowadays an AR-15 is any AR in 5,56 and even includes Wylde chambers which no real first issue Armalite ever had.
PS:
Semantics once Armalite owned the rights until they sold them to Colt who produced an M-series. Nowadays an AR-15 is any AR in 5,56 and even includes Wylde chambers which no real first issue Armalite ever had.