I am a new member from York, Pa. I am a Glock Armorer and NRA Law Enforcement Firearms Instructor with over 16years experience. I own OD Glock 23, Glock 19, Glock 31, Glock 27, Glock 21, Glock 34, Glock 17 and a few more. I have fired over 450,000 rounds out of my 17 with no malfunctions or issues period. Never a malfunction with any of them. The reason I believe I never experienced any malfunctions is due to the fact I use no oil on my handguns whatsoever. No oil , no build up.