Another feature not mentioned that constitutes an M4gery are the A3 sights with a removable carry handle and flat-top receiver, as well as the side mounted tactical sling mount in the front on the handguards.
Originally posted by Redlg155:
Take a peek at the pic above. A2 configuration M4.
Also, the side sling mount was made way before the M4 went in production.
Good Shooting
I'm going to take stab at this, but may be off.What's the difference between an A2 M4 and an A3 M4?