Just tried. A mix of 20 atrs AT15 mags in the following
Droped free and hold open
KAC 15. Y Y
Kac 15#1 Y Y
Dlask Y Y
Mac15 Y Y
SJ hardware sj 15 #1 Y Y
Sj15 #2 Y N. (Early proto type)
BMC the JAcK. Y Y
Areo prec. Y N
Nea gen 1 #1 N N
Nea gen 1 # 2 N Y
Blue line canada. #1 N N
Bl # 2. N. Y
Bl # 3 N Y
Nrinco. Y Y
Noviski gen 2. Y Y
Dpms 1994. Y Y.
XCR. Y. N
Very happy with these mags , just wanted to show you what we had tried. And what had worked