MG Industries have developed an interesting quick change barrel / takedown upper receiver for the AR-15.
Tam has got her hands on one of them and has an interesting discussion going on about it on her blog.
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FWIW: The MGI modular uppers and lowers have been on the market for quite awhile now.
http://www.defensereview.com/monolithic-rail-platform-mrp-and-quick-change-barrel-for-the-m4a1-carbine/
LMT has had one for a bit now too. I’ll stick to good old fashioned threaded on barrel though.
Doesn’t the 30+ year old Steyr AUG come standard with a quick change barrel system? What’s new?
Spiff