So it's kind of a must to install a AGB? My 11.5 is not really a rough shooter. Shoots relatively flat and the recoil isn't a while lot more than my 14.5 middy.
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It isn't a must, but it is better. I have been accused of being a control freak.
Mine is bone stock and I don't find the recoil to be objectionable. It is only 5.56 after all.......
I did a write up about it here 3-4 years ago, I sold the DD upper 6 months after I fixed it here on the EE as well.
http://img.photobucket.com/albums/v6.../WP_000306.jpg
If you are going to get one, get one with a correct gas port size, or have someone competent cut down a Colt M4 barrel and open the port. Otherwise go with an 11.5". Mine is still rocking solid after 4.5 years and 18K rounds.