So, if you have an Army M4A1, you may have an issue with that selector switch

FORT GORDON, Ga. – Spc. Alexander Musarra, Company B, 782nd Military Intelligence Battalion, from Miami, Florida, is shown here firing his M4A1 carbine rifle during the Stress Shoot Exercise which was an event on day one of the 780th MI Brigade’s Best Warrior Competition, April 23.

Saftey of use message:

  1. A small number (881 out of 259,000) of M16/M4 weapons have been found to potentially have an unintended discharge while manipulating the selector.
  2. An additional step in the updated Function Check will readily determine if your M16/M4 is affected.
  3. If your M16/M4 passes the additional steps to the Function Check to inspect for this problem, there is absolutely no need to change Immediate Action procedures.
  4. The previous Immediate Action procedure (“SPORTS”) has been since replaced with an improved procedure described in TC 3-22.9. TACOM and the published Technical Manuals have not yet updated to the new standard.

SOUM #18-004 alerted the field of an unintended discharge on an M4A1 PIP’ed (Product Improvement Program) weapons that occurred when the operator pulled the trigger with the selector switch between the SEMI and AUTO detents (outside of detent). The weapon did not fire when the operator pulled the trigger and instead fired when the selector was moved further. As a result of this incident, an on-going investigation determined that there is the potential for all carbines and rifles noted above, to behave in this way.

First, this potential mechanical problem is uncommon. The Army has converted 259,000 M4s to M4A1s in the past three years with the M4 carbine product improvement program. Out of 259,000, 881 have been found to exhibit this problem.

Second, TACOM’s updated Function Check will easily determine if your M16/M4 is one of those of the small number affected.

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About laststandonzombieisland

Let me introduce myself. I am a bit of a conflict junkie. I am fascinated by war and warfare, assassination, personal protection and weaponry ranging from spud guns and flame throwers to thermonuclear bombs and Soviet-trained Ebola monkeys. In short, if it’s violent or a tool to create violence it is kind of my thing. I have written a few thousand articles on the dry encyclopedia side for such websites as Guns.com, University of Guns, Outdoor Hub, Tac-44, History Times, Big Game Hunter, Glock Forum, Firearms Talk.com, and Combat Forums; as well as for print publications like England Expects, and Strike First Strike Fast. Several magazines such as Sea Classics, Military Historian and Collector, Mississippi Sportsman and Warship International have carried my pieces. Additionally I am on staff as a naval consultant and writer for Eye Spy Intelligence Magazine. Currently I am working on several book projects including an alternative history novel about the US-German War of 1916, and a biography of Southern gadfly and soldier of fortune Bennett Doty. My first novel, about the coming zombie apocalypse was released in 2012 by Necro Publications and can be found at Amazon.com as was the prequel, Chimera-44. I am currently working on book two of that series: "Pirates of the Zombie Coast." In my day job I am a contractor for the U.S. federal government in what could best be described as the ‘Force Protection’ field. In this I am an NRA-certified firearms, and less-than-lethal combat instructor.

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