It's actually why I joined Glock Talk. Early on my 23 failed to feed Gold Dots and HSTs with a Sure Fire x300 mounted. It fed FMJ rounds ok with light on and fed everything with the light off. finally tried some Winchester PDX rounds. They fed well enough for me to be comfortable with the combination. Empty rounds always ejected but the next round always looked like it wasn't brought up quick enough for the slide to catch it. Round was partially in the chamber/feed ramp and partially hung under the slide. I used new and old recoil springs, i used wolf +power mag springs and could never get the Gold Dots or HSTs to work. Recently put on a Streamlight TLR8 just past finger tight. Tried a couple mags of the PDX and they fed. This weekend shooting some FMJ with light on had two failures to feed with two different mags. That led me back here... again.
How much training do you have in handguns shooting? Shooting for 20 years does not mean you don't have terrible shooting habits.
Did you test shooting the pistols while engaging the lights, or just shooting like in daylight? What about one handed-- how about the other hand?
What style of grip do you use? Where is that support hand and what is it doing? Do you use a relaxed grip, or a death grip?
I'm not trying to offend....but trying to come up with reasons (hypotheses) on why a frame mounted WML should be affecting the slide's mechanics only on 40SW Glock guns---but not all Glock 40's, but only with certain owners/testors. The only variables that are poorly controlled (wildcards) are the owners/testors, how the gun is mounted, how the testing is done, and the ammo. We know 40/10 have snappier recoil than 9/45...is that a factor?
Your ammo seemed to be stuck halfway up the ramp. Is the the same type of malfunction the other Big Foots are seeing? Is that a typical "limp wrist" failure?
There is no denominator-- so if we are seeing 2000 Glock 22 guns do this out of 2 million, that is 0.1% of Glock 22's doing this, and 99.9% of Glocks not affected.
Glock, as a company should know the true prevalence of this-- if they are transparent, we would know why, but there is no reason for them to be transparent, so we may never know.
My idiot opinion:: forget the WML Glock 40SW, compromise with a WML on a different gun without internet discussions (not necessarily meaningful), or just a Glock 9mm with a WML. Or if you really must have a Glock 40SW with a WML, test it to your satisfaction-- if it works VOILA!- if it doesn't, then fall back to square one.
