Tony Posted August 26, 2016 Report Share Posted August 26, 2016 Having issue with my ar15 on full auto. Fires 3 or 4 rounds and then nothing. Round in chamber not fired. Looks like maybe hammer is following ????? Link to comment Share on other sites More sharing options...
james m Posted August 26, 2016 Report Share Posted August 26, 2016 (edited) I may be way off here but do you have a 3 shot burst only model? Edited August 26, 2016 by james m Link to comment Share on other sites More sharing options...
emmagee1917 Posted August 26, 2016 Report Share Posted August 26, 2016 Do you have a registered reciever , a DIAS , or a lightning link ? There is no " timing " on an M-16 like there is on a M1917 / M1919 . The auto sear keeps the hammer back until the carrier gives it a whack just before lock up . A round in the chamber and ejection of the previous case indicates full bolt travel .I'd look at the sear / hammer notches and see if there is some wear . If it's a registered receiver , sears and hammers and triggers are cheep .Another thing to look for is a broken hammer pin , that's been known to cause problems . It can break in the center and look normal unless removed .HTH , Chris Link to comment Share on other sites More sharing options...
wv1928 Posted January 17, 2017 Report Share Posted January 17, 2017 I had the same problem and it was the sear. The sear had cracked at the pin hole. Changed out the sear and fixed the problem. I also smoothed the edges on the new sear and removed a few little burrs. Good luck. Link to comment Share on other sites More sharing options...
DINK Posted January 17, 2017 Report Share Posted January 17, 2017 The most common cause for this is bolt bounce. The bolt closes, then bounces back slightly just as the hammer is falling. The cure is to go to a heavier buffer. Check to see what buffer you have and go to a heavier one. There are the regular "H" buffers ("H" means "heavy") then there are H2 and even H3 buffers, which get even heavier. A good place to research this is AR-15.com, in the Armory forums. There is a specific forum dedicated to the M-16. Link to comment Share on other sites More sharing options...
emmagee1917 Posted January 17, 2017 Report Share Posted January 17, 2017 This post is from Aug and he has not been back sence Sept.Chris Link to comment Share on other sites More sharing options...
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