I was at range thuesday and it seems that my new gen4 G17 jam with the light attached... my grip was really firm so i don't think it's me, cause without the M3 light the gun performed well. Anybody experienced the same? has Glock transfered the G22 problem to the G17...Gosh! I've seen that the empty cases are deformed on the top, and not so with my gen 3 which performed without a single problem with the light... I will try again next week, the gen 4 has 450 trough her and mostly FIOCCHI 115GR FMJ which are hotter than standard ammo.