just now got around to assembling the lower--
it does look to have some improvements to the old cav-arms design.
one of the things i like about it is so far ALL the mags i have tried have dropped free --no problem. the old cav had a few that wanted to stick a little when empty in the mag well-- the new design is much like a good metal in that regard.
still playing around with the trigger polishing--pretty soon it will be GTG!