Okay, I asked this in the pistol section and got nada. Zip. Total deer in the headlight looks I'm sure. I have a M&P VTAC 9 with a Gemtech tundra. It won't cycle. Other than a semi weak ejection the gun shoots great unsuppressed. Add the can and I get maybe 1/8" of slide travel. I tried wolff 14, 12 and 10 pound recoil springs (stock is 17#). The 10 I got it to at least stove pipe but lock up is REALLY loose. I wouldn't want to use that low rate anyway. I also tried the softer LID spring out of my tirant and no help. Any ideas? Anyone?

