Well now, that wasn't really fair of you. You paired the M16 and the M4 in the same option, despite the many shortcomings of the M4 and the fact that it's almost an entirely different gun (in terms of what comes out the end).
Second choice would have been Galil, I believe. The reason I didn't pick it was because it's quite a bit heavier, and in a mixed gender military where your troops have to carry a lot of stuff around, I don't see the Galil having much of an advantage - at least for us. Especially due to the fact that we're not using a lot of optics.
However, I still picked M16/M4 because of the platform. It is, by far, the most adaptable and modularly conceived gun of the lot, and has evolved into quite a "modern combat weapon" over the past 30 or so years - in no small part due to the fact that it's been monopolized upon as a tack driver and employed for long-range competition matches.
I might have picked something more durable and likely capable of "1 shot kills" than the AR/M16/M4 if we were in a different kind of war than we are now, but as I see it, what we've got now hits the spot.
As has been said, the M16/M4 prevails largely due to the fact that a lot of design features which have been popping up on other firearms were first made popular on the AR platform - specifically, the integral weaver rail on a flattop upper. Which brings me to it's other large strength: the fact that the upper and lower can be so easily mated and unmated, and that an entirely different upper can be put on the same lower, and vis versa. That (in conjunction with some of the AR platform's other refinements), in my mind, is an armorer's dream, making it all the better as a military/combat/combat assault rifle arm.
As for improvements: there are only two general criticisms I have for the platform:
1) The caliber. It would be nice to have something a little larger. Though, at the same time, the caliber can be seen as a strength: less weight to carry for the same amount of ammo, meaning a soldier can carry more. Kinda nice if you've got a need to put a lot of lead down range, I'd think.
2) The gas system. I've heard it's a problem for some, though I've never personally had a problem and have heard of several people who have put 5000+ rounds through their ARs in dusty, dirty environments without any cleaning. At the very least, (say) give the designated marksmen the more accurate uppers and the rank-and-file soldiers something more reliable/less needing of cleaning.
So, as for improvements: I don't really think there needs to be any made. It's a good weapon platform; I do think that military acquisitions could vary the rifles a bit, though: get rid of direct gas for those who don't need the accuracy (ie M4s, and most soldiers in general), and consider phasing in a different caliber bullet (6.8 or 6.5 - I'm a fan of 6.5).
Weapons I thought have promise as a platform but aren't used by anyone yet (still in development/pre-sales, etc.) are the H&K XM-8 (G36 heritage, ergonomic, weight reduction, uniform platform), the SCAR (not so appealing to me but it's still a good option - I'm not sure what it offers vs. the AR and it has diff advantage(s) than the XM8), and lastly, the KelTec RFB in .308 - simply because it';s the first .308 bullpup I've heard of, and from what I can see it appears to be a pretty awesome and revolutionary design (if it works).
ETA: oops, my post got chopped somehow.
I'd love to see a SCAR or XM8 in 6.5M or 6.8spc...
As for the guns I've got or shot from the list (in bold, * indicates those I've only handled):
Steyr AUG*
FN FAL
H&K G36
IMI Galil ARM 5.56 (ok, a clone)
IMI Tavor TAR-21
AKM (many variants, fa and semi)
M16A2 and M4 Carbine (many variants, fa and semi)
M14
G3A3
H&K G11
FN SCAR-L 5.56
H&K 416
FN F2000*
AK-74
AR-10
FN FNC
Not exactly an expert, but I like to think I think. It's just an opinion folks - deep breaths!
Second choice would have been Galil, I believe. The reason I didn't pick it was because it's quite a bit heavier, and in a mixed gender military where your troops have to carry a lot of stuff around, I don't see the Galil having much of an advantage - at least for us. Especially due to the fact that we're not using a lot of optics.
However, I still picked M16/M4 because of the platform. It is, by far, the most adaptable and modularly conceived gun of the lot, and has evolved into quite a "modern combat weapon" over the past 30 or so years - in no small part due to the fact that it's been monopolized upon as a tack driver and employed for long-range competition matches.
I might have picked something more durable and likely capable of "1 shot kills" than the AR/M16/M4 if we were in a different kind of war than we are now, but as I see it, what we've got now hits the spot.
As has been said, the M16/M4 prevails largely due to the fact that a lot of design features which have been popping up on other firearms were first made popular on the AR platform - specifically, the integral weaver rail on a flattop upper. Which brings me to it's other large strength: the fact that the upper and lower can be so easily mated and unmated, and that an entirely different upper can be put on the same lower, and vis versa. That (in conjunction with some of the AR platform's other refinements), in my mind, is an armorer's dream, making it all the better as a military/combat/combat assault rifle arm.
As for improvements: there are only two general criticisms I have for the platform:
1) The caliber. It would be nice to have something a little larger. Though, at the same time, the caliber can be seen as a strength: less weight to carry for the same amount of ammo, meaning a soldier can carry more. Kinda nice if you've got a need to put a lot of lead down range, I'd think.
2) The gas system. I've heard it's a problem for some, though I've never personally had a problem and have heard of several people who have put 5000+ rounds through their ARs in dusty, dirty environments without any cleaning. At the very least, (say) give the designated marksmen the more accurate uppers and the rank-and-file soldiers something more reliable/less needing of cleaning.
So, as for improvements: I don't really think there needs to be any made. It's a good weapon platform; I do think that military acquisitions could vary the rifles a bit, though: get rid of direct gas for those who don't need the accuracy (ie M4s, and most soldiers in general), and consider phasing in a different caliber bullet (6.8 or 6.5 - I'm a fan of 6.5).
Weapons I thought have promise as a platform but aren't used by anyone yet (still in development/pre-sales, etc.) are the H&K XM-8 (G36 heritage, ergonomic, weight reduction, uniform platform), the SCAR (not so appealing to me but it's still a good option - I'm not sure what it offers vs. the AR and it has diff advantage(s) than the XM8), and lastly, the KelTec RFB in .308 - simply because it';s the first .308 bullpup I've heard of, and from what I can see it appears to be a pretty awesome and revolutionary design (if it works).
ETA: oops, my post got chopped somehow.
I'd love to see a SCAR or XM8 in 6.5M or 6.8spc...
As for the guns I've got or shot from the list (in bold, * indicates those I've only handled):
Steyr AUG*
FN FAL
H&K G36
IMI Galil ARM 5.56 (ok, a clone)
IMI Tavor TAR-21
AKM (many variants, fa and semi)
M16A2 and M4 Carbine (many variants, fa and semi)
M14
G3A3
H&K G11
FN SCAR-L 5.56
H&K 416
FN F2000*
AK-74
AR-10
FN FNC
Not exactly an expert, but I like to think I think. It's just an opinion folks - deep breaths!