Figured you semi-auto guys might have some ideas for trouble shooting an AR that isn't running. It's my first AR "issue" and maybe I'm missing something obvious.
When I first got it (S&W MP15T) it ran everything no issues, wolf, winchester white box, american eagle etc. no hiccups with both the factory mags, magpul mags, NHMTG, Cprod, D&H etc. Probably the first 750-1000 rounds no issues. I honestly had not shot it since probably a few months. Took it out to the range this week and it seems like it's short stroking, it's not picking up a round every 5-6 rounds through a mag and a couple times it has not held the bolt open on the last round. So I read up on a couple AR15 cleaning posts and cleaned it as well as I could, carbon deposits everything, oil lubed it really well. Took it back out to the range today, same problems across mags and ammo.
Once and awhile it will shove a round at a high angle into the top of the chamber and jam that way, and when I inspected those rounds it looked like the bolt was catching the case right at or just after the case rim because it would be gouged from that rim up the casing.
It's stock except for an ACE stock, Geissele trigger, eotech, ergo grip and a badger handle latch. Previously it was running okay with all of those items the only new one since it was reliable was the trigger.
In fact I got so fed up with it today I brought an old buffer/spring combo with and cut about 1" off the spring and shaved about 1/8" off the buffer pad just to try and force it to run, same problem.
When it does run it seems like the ejected cases are getting tossed well clear of the gun, as normal. Could there be something that would impact the height of the magazine causing it to sit too low?
I'm going to swap the stock for the factory recoil tube/stock and also change to the factory trigger just to see if that helps.
Thanks in advance!
When I first got it (S&W MP15T) it ran everything no issues, wolf, winchester white box, american eagle etc. no hiccups with both the factory mags, magpul mags, NHMTG, Cprod, D&H etc. Probably the first 750-1000 rounds no issues. I honestly had not shot it since probably a few months. Took it out to the range this week and it seems like it's short stroking, it's not picking up a round every 5-6 rounds through a mag and a couple times it has not held the bolt open on the last round. So I read up on a couple AR15 cleaning posts and cleaned it as well as I could, carbon deposits everything, oil lubed it really well. Took it back out to the range today, same problems across mags and ammo.
Once and awhile it will shove a round at a high angle into the top of the chamber and jam that way, and when I inspected those rounds it looked like the bolt was catching the case right at or just after the case rim because it would be gouged from that rim up the casing.
It's stock except for an ACE stock, Geissele trigger, eotech, ergo grip and a badger handle latch. Previously it was running okay with all of those items the only new one since it was reliable was the trigger.
In fact I got so fed up with it today I brought an old buffer/spring combo with and cut about 1" off the spring and shaved about 1/8" off the buffer pad just to try and force it to run, same problem.
When it does run it seems like the ejected cases are getting tossed well clear of the gun, as normal. Could there be something that would impact the height of the magazine causing it to sit too low?
I'm going to swap the stock for the factory recoil tube/stock and also change to the factory trigger just to see if that helps.
Thanks in advance!