Used a PSA lower and build kit. I have a feeling it may be a trigger disconnect or gas issue but im not sure how to check for the disconnect issue.
Take the upper off and do a function check. Do not let the hammer hit the lower as it could crack it.
1 Like
if the trigger isn’t resetting it wouldn’t be a gas issue. It’s probably the disconnect just needs to be cleaned up a little bit. And I mean a little bit. You also might just oil it up good and dry fire it a lot. I heard that that might smooth the surfaces out a bit.
1 Like
Check to make sure the spring is right side up in the disconnector and the cup is aligned right.
3 Likes
He said a new round is chambering. My money is on a spring, not the gas system.
with both of my rifles when this was happening they were chambering a round. The trigger just wasn’t resetting. I would rap the side of the rifle with my palm and it would release it and reset. That is what gave me the tipoff that something was hanging up. I didn’t even need to remove the firing system, I had a set of small honing stones and just touched up the surface a tiny bit, a couple small swipes on the mating surfaces. Then try it again. That was all it needed on one rifle, the second one needed a couple more swipes and it was fine.
But then again, I replaced one system with a Rise 140 and the second one is getting a Rise LE145. I love tinkering with these things 
Found 1 issue, spring for the disconnector was broken. Had a spare trigger lying around, swapped it out. Thanks for the advice everyone.
6 Likes
Had a feeling. Glad it all worked out and we all could help.
(heavy sigh)
Mine did it twice in its first trip to the range. Cycling the safety cleared the reset. Complete upper and lower mil-spec ‘kits’. Stripped, cleaned and lubricated before firing. I haven’t removed the fire control group, but I don’t see anything obviously broken or burred. I’ll try it again to see if it just goes away.
Dammit, I just got this thing in. I don’t want to mess with shipping it back. What a PITA.
Welcome to the forum!
Don’t worry you will get it straight and learn more about your rifle.
Did you assemble it or did it come assembled?
Check disconnector spring has fat side down like rufus suggested
Do a function check like Guitar Guy recommended Perform A Function Check
I ‘assembled’ the kit by attaching the complete upper to the complete lower with the two captive pins. This is my first AR, but I know my way around pump shotguns and pistols. AR’s are definitely easier to strip than a Browning BPS.
I racked it on the first occurrence and an unfired round ejected. On the second occurrence I cycled the safety. I’ll recheck the springs in a little more detail, but they look right so far. I’m researching polishing, but I sure as hell don’t want to blow past the hardened surface.
New might just need a little break in.
What ammo were you using
Your first jam did you look at primer on ejected round was there a dent?
Make sure you dont ride the charging handle and it is in full battery.
Im not sure what cycle the safety is. Can you explain more? If I can help I will.
You dont need to polish. Post some pics of the internals.
Also, make sure you lube it well. AR’s like to be wet.
3 Likes
My definition of wet is a mist or glaze. I use Hoppes and Ballistol products. I have not greased any parts.
Remington UMC 55gr FMJ (Freedom Bucket Special) for ammo. I did not check the primer on the ejected cartridge since I knew the hammer didn’t fall (it went back into the mag and fired on the following second shot).
I slingshot the charging handle as I would a pistol barrel.
By cycling the safety, I mean that I moved the selector from Fire to Safety, then back to Fire. The range was hot and I had ears on, but I think I felt tension in the system.
I’m new to AR’s, this was my first run, I shoot lefty, the range was a little Fuddish and the front MBUS stripped so I didn’t even get the rifle sighted. Basically, I was dealing with a lot of sh!t. I’m not totally ready to blame the equipment, but the fact that it happened twice concerns me since I bought this for home defense.
My best guess by the wear on the top of disconnector makes me think either its out of spec or the spring for disconnector is upside-down. Does the lower pass a funtion check? With your hand on top of hammer so it wont slam into lower,cycle the trigger. When you reset hammer do you feel the disconector hold when you release the trigger?
1 Like
Try some different ammo also. My experience with Remington is that it is a little weak.
That’s the best I can do with the FCG still in the lower. The springs look right to me. I can’t replicate the problem at home with the upper on or off. It’s definitely not the finest trigger I’ve experienced but I’m no diva - I just want to be confident the damn thing’s going to function properly. We’ll see what happens at my next trip once my sights are in.
1 Like
Those springs look dry. Oil them.
1 Like
My trigger won’t reset on my brand new PSA EPT lower. Tried standard function checks and it failed every time. Totally bummed after the excitement of adding the PSA Upper. I was looking forward to adding another reliable AR to my collection. I plan on contacting customer service. Any tips in the meantime?