When I chamber a round very slowly, the slide stops about a 3/16 of an in from locking up. A little nudge, and it locks up... It does this with all ammo types. My HK P2000 definitely does not have this problem. If I do the slow chamber test, it locks up like a bank. Does your M9 do this? I'm wondering if the M9 design isn't as robust, or do I need a stiffer mainspring? It's like the mainspring isn't stiff enough... I don't know, what do you think? Thanks guys!