Originally Posted by JTJ
I have the 20" sporter style. I have a Burris Fullfield II 3x9x40 BDC on it. It has been so hot here I have not been able to take it to the outdoor range. 90 at 5:00 AM and 123 in the afternoon. One ragged hole at 25 yards from a very poor rest at the indoor range. I was using the 10 round mag that came with it and have not tried any of the 30's or my other 2 10's.
I used the stock 10 rounder, bushmaster 30, 10 & 5 rounder's, PMAG 20 and 30 rounder's. What I have notice is too chamber a rounder from the mag, I have to slightly push up on the mag and movement with ease. This is will all magazines; however, at home Thermold magazines (20 or 30 rounder) would not seat in the magazine well at all, push up and they drop out.
I have not tried SIG AR15 magazine.
The Thermold magazines work in AR platform; except for 1 that does not lock the bolt to the rear!