I'm baaack! Bear with me guys, working on issue I previously posted. Got to looking at mags after work today; new ones,noticed with all 15 rds loaded verrry tight fit,but not with 2 provided by a friend (obviously used).Issue was with slide locked back,would not feed first round when "slingshotting." Older mags do this no issue. Is it possible mags so new need "breaking in?" When I take about 5 or 6 rds out of new mag, go through same process, first round feeds no problem. When "slingshotting" first rd, full mag, from closed slide, still feeds first rd even from new mag,but I suspect due to further travel, if that makes any sense. When manually emptying new, fully loaded mag by hand, very hard to strip that 1st round or 2, then of course gets easier and easier. Need to work new mags more, give more break in? I think I'm getting to the bottom of this, any other suggestions would be welcome. Thanks.