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Posted: 1/24/2008 7:46:32 AM EDT
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A2 has a 8/3 sight drum A3 with a removable carry handle has a 6/3 sight drum and needs a F marked front sight base. Easier to mount optics onto the A3 because of the integrated pic. rail. M4 is a carbine, you can put either the A2 or A3 upper on it M4 barrel options are.... 14.5" with $200 tax stamp to ATF for a short barreled rifle 14.5" with perm flashider to bring it out to 16" or more 14.7" with perm A2 to bring it out to 16" 16" M4 profile barrel now just to confuse you even more.... carbine length gas systems mid length gas systems rifle length gas systems rifle length is the longest, carbine is the shortest, mid length is a bit longer than the carbine but shorter than the rifle. personally all my rifles are A3's....except for my one KISS rifle I'm building which will be a bone stock 20" A2 rifle (not your usual A1 KISS...but hey it's a very loose definition anyways). A3's allow you to mount optics in a better position and if you want irons it's easy to throw on the carry handle or buy a BUIS that you can use. I only have carbines and rifle lengths, I don't mess around with the mid lengths just because they don't look right to me. |
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