Actually I think the Beta Project Pmags are ok. Using my blow back monster (Steel bolt + heavy buffer) Can clear mag with single shot without problem. Have not tested auto shot but i think it should also be fine. Still plenty of gas after clear mag. The mag gets cold after use, but not as dramatic as become watery.
The advantage is really light, and also up to standard WA size (same as G&P, bomber etc). So it is ok to interchange with WA system actually.
The disadvantage is it required removing the lower plate for charging gas. And the fact that my friend is selling me G&P mags relatively cheap (because they leak and etc) I just dont want these anymore.
[ 本帖最後由 dennislau1 於 27-7-2011 23:38 編輯 ]