AR Help!!!

Remington country

Remington country

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Hey guys

So i finally built my first AR-15 its a Rock River Flat top upper on a Armalite 223 Lower. The first time i put the Upper on the Lower the bolt functioned perfect. I took it to the range for the first time and noticed that the bolt was not catching on the Bolt Catch it would just slam Shut Dont have a hole lot of experince with it. A little History the Lower was a stripped lower I installed all the spring and what not Maybe its a bad spring in the bolt catch not sure any help would be great thanks again other then that the gun shoots amazing and connot wait to get back to the range :sniper:
 
Try a different magazine.

See if it works and try to isolate the problem from most likely and easiest to fix before proceeding to the more complicated stuff.


Good luck.
 
Last edited:
Epoxy7 said:
Try a different magazine.
Click to expand...
I agree... It's most likely a magazine issue.


Some other things to think about:
  1. Can you manually lock the bolt back?
  2. Have you taken the upper off the lower and then inserted a magazine into the lower (without the upper on) and look at what the bolt catch is doing?
  3. If different magazines doesnt fix the issue then I'd drift out the bolt catch roll pin and check that everything was installed correctly using the correct springs.


On a side note... I really dont think its a bad spring... The wrong spring? Maybe... But bad? I wouldn't want to bet on it.
 
Does it work hold the bolt back when you manually raise the catch?
Or is it just failing to hold open after the last round?
If the later, I'd also recommend trying different magazines. If it does it with many mag types, then I'd start looking at issues with the rifle.
 
Could be short stroking "did you lube her good? also check you gas rings"

Also when you installed the bolt catch, did you install the detent too? does the bolt catch work when you use a empty mag and #### the gun?
 
Remington country said:
I'm at work now but the Bolt will not catch with either a mag or no mag in it. I cant see how the buffer spring would have anythign to do with the bolt catching.
Click to expand...

If the buffer spring is too long "it will bunch up and stop the bolt from going fully to the rear"
 
Sounds as if the carrier assembly is not coming back far enough for the catch to engage. Going to need to find out why not.
 
What bolt carrier are you using? What buffer is installed? Are you CERTAIN it's a carbine spring?

Did you assemble the lower yourself, or is it a factory assembled lower?

If you did it yourself, I would suspect that the detent is missing under the bolt catch.

When you hold in the bottom of the bolt catch (forcing it into the raised position) and then manually cycle the action (no mag in the gun), does the bolt lock back? If yes, I would suspect that either the spring is wrong or the detent missing under the bolt catch.

Do the hammer and trigger assembly have a lot of rounds on them?
 
Hey Yah I installed all the parts in the Lower so the hammer and trigger assembly only has about 40 of the rounds i put through it. The Bolt will not catch any time ill push that pin out and change the detent and spring i ordered new ones from Brownells including a new bolt catch just to be sure ill try that and see how it works

THanks again
 
Hey Guys, I have a some what similar issue as well. I had a Questar AR15 which worked fine no issues. But I swapped out the lower receiver (i wanted an aluminium with the pics for fire/safe)... anyways, I did my function checks and everything passed, but when I got to the range, everything work the first time. I'd shoot 1 round, bolt's locked back and the gun's empty.

Shot 2 rounds (slow fire), gun's empty bolts locked back to the rear. So on the 3rd check I loaded up 5 rounds, and shot them in rapid succession, bolt didn't lock back.... tried it with a 2nd mag, same issue. 3rd mag worked a few times...

Anyways, long story short, the bolt locks to the rear (most of the times) when I'm shooting slow fire, but on fast shooting it usually doesn't lock back.

I tried cleaning out the gas tube as bet I, incase there was some fouling/buildup, but it didn't seem to help.

Any suggestions?
 
Never clean the gas tube - it is basicalyl self-cleaning.

If you are getting intermittent bolt lockback, either your ammo is weak or the magazine spring isn't strong enough. Sometimes a mag spring can get hung up on a round limiter rivet as well.

Try another mag and try some different ammo. Should fix things for you.

Also, lube the pivot pin for the bolt catch.
 
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