So, manufactureres started referring to their "m4gerys" as the "A4". Long story short, Colt sued Bushmaster (and won) over the use of the name "M4". and with the muzzle device the barrel was a legal 16". They used the 14.5" govt profile barrel too.
It had a fixed stock that looked collapsible, and a permanently attached muzzle device that looked like a flash hider. The civilian market wanted a clone of the M4, and just prior to the AWB sunsetting, Bushmaster started turning out a civilian "M4". The handgaurds were oval with an extra heatshield. The real M4 was of course "select fire" and had a 14" barrel that was small under the handgaurds, and had a place turned down ahead of the front sight to allow attachment of a m203. Now, up until now I've been talking about civilian firearms, but when the military started switching over to the "M4". The A3 is pretty much the same as the A2, but with the removeable carry handle "flat top". You can find carbines in both A1 and A2 configurations, but at that point, most were 16" barrel with fixed carry handle. If we're talking about the military variants it's a long story, but as it pertains to ar15s.Īn A1 has a lite profile barrel, 1/12 twist, fixed carry handle, with a rear sight that's only adjustable for windage, a slab side receiver, triangle handgaurds, etc.Ī2 has a heavy barrel, either a 1/7, or 1/9 twist (depending on manufacturer), round handgaurds, rear sight with adjustments for both windage and elevation, a left-handed brass deflector,etc.
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