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Is it possible to mount an A4 (or A2) upper to an M4 lower? I wouldn't imagine it couldn't be done, but honestly I don't know. I figure the two are compatible, but I don't know if there would be something prohibiting the two from working together. Units could keep both the uppers in stock depending on mission. M4 uppers for certain areas like Iraq where the possibility of urban fighting is greater, A2/A4 uppers for places like the 'Stan where longer range would be needed. But still having the M4 lower capability for the adjustable stock.
Would something like this be better and more fiscally sound? I know when the USAF converted it's M16s to the A2 standard, they got parts kits and replaced the upper, pistol grip, fire control group and butt stock and mounted it to the M16 lower receiver for about two-thirds the cost of buying a new M16A2. At least I was told it was about two-thirds the cost. I might imagine changing only the upper receiver would cost less.
Just wondering if something like this is possible as opposed to fielding a completely new system or round.
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