greetings,
May I please solicite your indulgence to ask a few basic (dumb) questions?
I have an AR "Sporter" H-bar 20" from COLT. Purchased in 1994.
Just behind the front sight the barrel is stamped: C MP .556 NATO 1/7 HBAR.
The side of the lower receiver is stamped (cast?) :
Sporter
Match...