out of spec
5/23/2014 12:46 PM
This upper is slightly out of spec in the charging handle channel area. Milspec uppers have some extra room in the charging handle channel to allow for dirt and gunk to have somewhere to go. These do not. A standard charging handle will just barely fit in, and some of the oversized 'gasbuster' type handles will not.
I used this for a 9mm build, and it worked great, despite the tight charging handle channel.