AR22 uppers and magazines

Tips on getting the Smith & Wesson M+P 15/22 magazines to fit into the AR Lower. While we here at www.taccom3g.com develop our products for competition like USPSA or Steel Challenge, Rimfire Challenge, etc.
The aspects of reliability is a huge asset.

[@squidinksplat7240]

Took out the 9mm upper I bought from you to the range the day before, absolute workhorse. Used supersonics and subs and didn't have any issues, thanks Tim!