This is a LEO refurb from Sig, several hundred handloads of various bullet and charge weights. All mags are Sig. Yesterday and a few times in the past it has done this, today it failed to lock back after last round with all four mags.
Anything obvious I should look for/at.
I, have had to modify my grip/hold from that of a 1911, could it be the way I grip/hold.
