Dasa Posted June 6, 2020 Share Posted June 6, 2020 I have never had this failure before on an ar 15 but this week I have had two different rifles have intermittent failure for the trigger to reset. Both rifles had a larue 2 stage trigger that had only a couple hundred rounds through them. One was a bcm upper 9” with factory Hornady 110 loads while suppressed. The other was an Smith and Wesson 15-22 standard length with cci sv. In both rifles it cycled and ejected fine and loaded correctly. The trigger was simply dead and wouldn’t reset unless you ejected the round. I checked every time and round loaded into another magazine and fired. This happened a dozen times or so each rifle. Any helpful suggestions for correcting? I am thinking trigger springs but seems odd for larue on two different rifles. Link to comment Share on other sites More sharing options...
Alaskapopo Posted June 6, 2020 Share Posted June 6, 2020 I have only had stock type triggers work well in ARs in 22 long rifle. 9mm is also tough on triggers and you need to get triggers that can handle the bolt speed from a blowback Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
NOSHMJ Posted June 9, 2020 Share Posted June 9, 2020 Do you have adjustable gas bolcks on either gun? Maybe undergassed and short stroking??? Link to comment Share on other sites More sharing options...
Dasa Posted June 9, 2020 Author Share Posted June 9, 2020 No adjustable gas blocks on either the 300blk is a standard bcm built upper and the 15-22 is just the standard blowback. On the 300blk it was supersonic factory loads while suppressed (so if anything a little over gassed at the time). I will try swapping to mil spec instead of larue mbt to see if it fixes the issue. Link to comment Share on other sites More sharing options...
NOSHMJ Posted June 9, 2020 Share Posted June 9, 2020 good luck Link to comment Share on other sites More sharing options...
Screaminyz Posted June 24, 2020 Share Posted June 24, 2020 I’m not sure if you bought the Larue mbt’s new or not but I thought they included a heavy and medium spring in the package. I might be thinking of a different trigger but if they do I would make sure you are using the lighter of the two. Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
mpom Posted June 24, 2020 Share Posted June 24, 2020 Have you called up Larue? Might be a problem with that unit, am pretty sure they will replace it. Mark Link to comment Share on other sites More sharing options...
JonWayne Posted June 27, 2020 Share Posted June 27, 2020 Does the hammer stay stuck on the rear hook on the disconnector or does it follow the bolt? I’m thinking the disconnector is getting hung up. Check the springs and make sure the trigger and disconnector rotate freely on the trigger pin when removed from the lower. Two in a row seems really odd which is why I would pull the lower apart and look everything over. Link to comment Share on other sites More sharing options...
outerlimits Posted June 28, 2020 Share Posted June 28, 2020 had this happen on the last stage of a major...single shot AR. couldn't figure it out on the 4 hr drive home. next day went to clean the gun, split it in half and happen to look into the lower and staring me in the face was a spent primer that had lodged itself under the rear of the trigger. bizarre. Link to comment Share on other sites More sharing options...
dekindy Posted July 7, 2020 Share Posted July 7, 2020 Watched an AR15 cleaning video where he referenced blown primers several times. That is the only reference I have ever seen until now. Must be a real thing.Sent from my SM-G920V using Tapatalk Link to comment Share on other sites More sharing options...
AHI Posted July 7, 2020 Share Posted July 7, 2020 Start with a good complete cleaning. 22s are /can be very dirty. 300 BO suppressed is very dirty. Link to comment Share on other sites More sharing options...
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