bensdad wrote:What does "WML cycling malfunction" mean?
WML = weapon mounted light. IE a SureFire X300 or Streamlight TLR-1
Glock frames flex and warp under recoil, and the flexing puts friction on the slide, which helps reduce the speed at which the slide cycles. When you attach a light to a Glock frame, it stiffens the frame and interrupts the harmonics of the frame. As a result, less friction is applied to the slide, and the slide speed increases. With the G22, it uses the same weight recoil spring as the G17. The .40S&W has higher energy than a 9mm, so when you reduce frame flex, you can increase the slide speed to the point where it "outruns" the magazine. That means that it cycles so fast that it starts to go back into battery before the magazine can push the next cartridge up to the feed lips at the top of the magazine to be stripped off. All the slide needs to do is miss the rim of the case, and you will have a failure to feed malfunction that generally lodges a cartridge in the ejection port/breech face area. The problem with this is that if you do immediate malfunction clearance (tip/tap/rack or tip/tap/tip/rack for you wrong-handed shooters

), you need to rotate the gun outboard substantially to ensure the lodged round ejects, or you may get a double-feed.