I think the best thing is what knights and colt (cm/sp901) are trying to do with the somewhat redesigned lower that takes standard uppers... now about the CHEAPER part... good luck.
I think the only way to cut cost would be to change materials and anything cheaper seems to not be as good structure-wise. Anything stronger and lighter than aluminum may be too brittle or will be a lot more expensive. Every industry wants something stronger and lighter, so it wont be cheaper due to demand, unless something gets a huge scale up real quick. Plastics bend too much, or are brittle, ceramics are too brittle, and nanocrystalline metals are very expensive, but would be very light. Its more of an economy issue than an engineering issue, it seems.
You could make something similar to an ar-180 cheaper, but you lose in other areas, as already stated.
OP. From what I can tell, ars are most loved since :
1 - made in U.S.
2 - LARGE support system
3 - reliable as any other(if made right)
4 - Best accuracy potential with match barrels
5- ergos and speed. They can be set up to be fully ambi and can be faster to operate than any other gun out there.
The next best thing we have here IMO is the AK which has a short handguard, slower reloads, and its barely any cheaper for a quality one. Some people prefer them, but most lean towards the AR. I honestly dont see much improvement left for firearms. I think the next step is gonna be a totally different weapon (small-arms rail guns maybe? And thats gonna be a LONG time).
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