Folks, new gen 3 g19. 300+ rounds thru it no problems. Gun show last week. Certified glock armorer installed 3.5 lonewolf trg connector, extra power trigger spring, Glock extended slide stop, lonewolf extra large mag release. Shot 220 Remington umc thru it today. About 6 failed to load. Couple of stovepipes. Where to start looking for problem? Worried I've jacked up a perfect gun somehow? Thx for any help!