I my self own the M15A2 and see no difference between my buddies A4. (except of course the detachable carry handle). All the stock internals are the same. But I recommend that you change the gears, from what I've heard the classic army gears aren't very reliable.
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M15A4 Carbine(Classic Army)
-Systema M130 FTK
-HurricanE 551 Holo Sight
M1911 (WE)
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