I bought a complete lower from an individual. I bought a complete upper from palmetto state. Took them to the range today for the first time. Tried loading a round and the round went in the chamber but bolt stopped short of closing. I used the charging handle to close the bolt manually. Sighted in on target and click...no boom...pulled back on charging handle to make sure lug had a hold of the round it did so I shut it again and click...Repeated this process several times with other rounds and only once got the gun to fire...any clue what I got going on here...kinda bummed cause I wanted to sight it in for my boys to take on the Tennessee youth hunt...

Also several times after manually closing the round would not be grabbed by the bolt.

Are you pushing the release on the side and letting the bolt slam forward ?

Dry fire it with the upper and lower separated. It should cock and fire repeatedly with no issues unless selector is on safe. The click should be covering that, but i’d Start there. Then tear it down and clean everything and lube it up good. New bolts can be rather tight until worn in a little

You may consider letting the hammer fall on your thumb and not the actual lower to avoid possibly cracking it.

My first thought exactly.

I’d be leaning towards an ammo, magazine, or bcg issue. Were the primers dented on the ammo from the times the rifle went into battery and “clicked” but didn’t fire? If you’ve got access to other ammo & magazines those will be easy enough to eliminate as possible causes. Wish I were closer and could help you figure it out, always easier when you can lay hands on the problem. Like Dixie said, let that bolt slam forward when loading it. AR’s don’t respond well to babying or easing the bolt into battery.



This too ^^^^

Did you clean an lube it. A dry AR will do this. Especially the BCG.

Beat like a rented mule!

Should have said that the primers were not dented al allZ

What do y’all recommend lubing it with. I have rem oil on hand.

Rem oil will work, take BCG apart to oil and see if anything doesn't look right.

If that is what you have use it. I know a guy that sprays Pam on his. Can't be any worse than that stuff that comes in that OD green little squirt bottle.

I prefer StrikeHold CDLP but a little Dexron ATF will go a long ways towards lubricating a firearm.

Lube it up and work it by hand a few dozen times. You will probably feel it loosen up. PSA sells a good product, but they are tight and dry.

The last one I put together using their upper, I had to run a mag through it with a BCG from another gun then put the one it shipped with back in it, and it runs great.

If the bolt is closing and hammer is falling and you aren't getting primer hits, that is a headspace issue - maybe a broke firing pin - but either way, a whole different ball of wax.

If the bolt isn't closing all the way, the hammer may be hitting the rear edge of the carrier and making sound like everything is working correctly when the trigger is pulled, when it really isn't.

As stated above, let it fly home by releasing the BCG with the bolt release, or sling shot it with the charging handle. after lubing and hand cycling. Let us know what happenes

I'm no expert with them but have lots of experience. I'm over toward Arab so if you want to bring it over and I can look at it plus take it down the road to a secluded place and test fire it.

Mine usually has dented primers just from chambering a round.

do not close the charging handle manually pull it back and let go so it slams into battery it needs some force to close and properly lock the bolt lugs. also check firing pin if its going into battery and not even denting primer it may be missing or broke.

Still wondering about this.

Maybe obvious, but was the firing pin retaining pin installed before the firing pin?