AR-15/M4/M4A1 Carbine Reliability Issues: Why They Occur, and Why They’re Our Fault!Why M4's have reliability issues...and why it's our fault! By Michael Pannone December 24, 2008 I fired 15,000 rounds through a semi-automatic M4/M4A1-type direct-gas-impingement (DGI) carbine in 31 weeks without a single malfunction attributable to anything except bad ammunition or bad magazines, with a grand total of 9 malfunctions. The least number of rounds fired between cleanings was 960 rounds, and the only parts replaced were gas rings at 8,860 rounds. And you can, too. The M4/M4A1 Carbine (and civilian-legal tactical AR-15 carbine) is simultaneously a much beloved and much maligned rifle. But why? It’s beloved because it is so simple to maintain and ergonomically the best-designed assault rifle/carbine system of all time. It’s maligned because many have not maintained it as they should, and reliability has subsequently suffered. If the M4/M4A1 is properly maintained, and a reasonable amount of lubricant is put on it, it is extraordinarily reliable. …defensereview.com

The Big M4 Myth: ‘Fouling caused by the direct impingement gas system makes the M4/M4A1 Carbine unreliable.’By Mike Pannone Info@CTT-Solutions.com All photos contained in this article were taken by Mike Pannone for DefenseReview.com, and are copyrighted. Mike Pannone and DefenseReview.com own the copyright on these photos. March 19, 2010 Here’s my question for those that subscribe to the direct impingement fouling concept: I fired 2400 rounds of M193 through a 14.5” M4-type upper receiver from Bravo Company Manufacturing (BCM) with no lubrication, and without any rifle-caused malfunctions. So; why can I get my direct impingement rifles to repeatedly do things that conventional wisdom says they can’t do? This article is not a direct impingement vs. piston driven operating system debate and does not discuss piston guns at all. It is specifically dealing with a 14.5”AR-15 upper receiver with .062” gas port that’s as close to a Mil-Spec M4/M4A1 upper as I could find on the civilian market. All I have ever asked and required of myself (and others) as a …defensereview.com

AR15에서 탄창 다음으로 기능고장을 유발하는건 갈퀴와 스프링의 불량이나 군대는 그냥 총이 발사만 된다면 멀쩡하다고 방치하는 경우가 잦으며 "총기 관리"는 총기수입 뿐만 아니라 부품의 교체까지 포함하는 개념이 되어야 한다고 함


5천발을 사격할때마다, 혹은 파병 전에 소총을 점검해야하고 탄창에 주기를 해 탄창을 구분할 수 있게 해야하며 소총별 고장기록을 일지로 작성하고 스스로 관리하는 문화를 교육시켜야지 직동식 AR의 문제가 아니라고


패논의 SOPMOD BCG 업그레이드 킷이 적용된 노베스키제 14.5인치 N4 VTAC 소총은 15000발을 사격하는 과정에서 3번의 기능고장만을 경험했으며 이것도 탄/탄창 문제였다고 함

BCM 14.5 M4로도 윤활류 없이 2400발의 m193을 쏘는 동안 한번의 기능고장도 없었다고

이후 밀스팩 M4와 비슷한 사항의 AR15역시 테스트해봤고


가스 직동식 AR15의 탄매가 소총의 작동에 지장을 주는 포인트는 리시버 내부에 탄매로 인해 BCG가 더 많은 마찰을 받게 되서 왕복속도가 느려져서 발생하는 것으로 이는 더 쌘 장력의 버퍼를 사용함으로서 어느정도 완충 가능하고 그렇지 않아도 실질적으로 문제가 생기는 시점은 손질 없이 2450발을 사격한 이후부터라고 함

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아 참고로 이거 08년 기고 글임