Purchased a new G36 a week or so ago and within 400 rounds the recoil spring jumped the retaining flange rendering the gun inoperable. fixed that by installing a "Wolf" sping and guide rod kit. However, I am now experiencing misfires every 100 rounds or so. My 1911's eat the same ammo with no problems. Have been told this common with Glock's. Anyone have a suggestion on how to fix this problem.