Unfortunately a round that would meet the needs won't fit in the above mentioned crappy M16 magazines or M16 magazine well.
i have the solution for a bigger round that will single stack in your standard ar magazines!! all u need is the upper.. i found one on rockriverarms..
http:////www.rockriverarms.com/index.cfm?fuseaction=category.display&category_id=253
oh yeah and i have an ar with 11.5 inch barrel and it hasnever had any problems besides the magazine..the one that causes the problem is a 40 rounder and the last round wont load the bolt stays back with an extra round in the mag thats the only problem ive had it is accurate too! i shot a 3 shot group today at about 50 yrd (backyard setup)shootin rapid fire nothing slow and paced out and put them basically right on eachother they were all touching.
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