Ok, had Mile Hi Shooting Acc. check it out. One thought, Mags are the "short" 10 round, double stack type that are AW "style". These may not be a proper fit in the AICS chassis. I exchanged them for two AICS style
mags, one a 10 round and the other a 5 round, not as compact as the 10 round double stack type, but hopefully they will stay in when I shoot with them. Gunsmith thought the AW double stack mags should work in
this rifle but couldn't find a problem and even tried a test shot and the mag stayed in. Only difference was he used a suppressor on my rifle and this was perhaps enough to minimize the shock of the recoil to prevent
the mag from coming out. Gunsmith thought both types of mags, AW and AICS, should work in this mag-well. I did not want to go out all the way to the range and have the AW mags eject out as they did last time so
hopefully this time the AICS mags will stay in. Perhaps I did not have the mags in properly up into the mag-well, but if they are that difficult to get into the well, they may not be user friendly. I have another AICS chassis
system in a Remington 700 model in 7 mm mag, and all three of the mags work well without such issues. All are of the AICS type, I have 2 five rounders and 1 that is a ten round mag. I've never had a mag pop out unless I had not inserted it properly and if I gave the mag a firm tug it would feel wrong or simply come out of the well. But these mags would stay in firmly in the mag-well yet would fall out very decisively every time I fired the weapon.
I'll give an update on the AICS mags and how they function. If the AICS mags don't work, I'll have the gunsmith at Mile Hi check the rifle out again, perhaps it is the mag release spring. Thanks for all the advice.