Help with my AR-15

[BigMike]

If you are getting feeding but not resetting the trigger it sounds like you have a gas/buffer issue.

Put one round in the mag and shoot it. If it doesn't lock back on the empty mag you have a gas issue and should check the gas block alignment first.

 

[Allsmiles]

If you have another AR, swap lowers and see if it runs. Eliminate things one by one.

 

[212Josh]

A lot of good suggestions, make sure the bolt isn’t filled with oil around the firing pin. It can have a hydraulic effect and slow the firing pin down.

 

[Gingerbeard Man]

If you read some of their reviews on their 7.62x39 uppers, you will quickly realize that their firing pins are
If you're going to keep it (I don't know why you would) switch out the firing pin for this
https://www.blackriflearms.com/AR-15-762x39-545x39-Enhanced-Firing-Pin_p_9.html
And while you're at it, get the extra power hammer spring

Black Rifle Arms Enhanced Power Hammer Spring, Enhanced Hammer Spring, Hammer spring

www.blackriflearms.com

Personally I'd send that **** back to BCA and use it as a lesson learned. It's junk. All of it.

Here's some firsthand experience with their "quality"

Bear Creek Arsenal - Just Say No!

Had a spare lower and wanted to put together a cheap little blaster in 7.62x39. It wasn't the price that got me as much as the side charging was intriguing. AK charging on an AR platform? Sign me up! The 7.5" complete upper showed up quick and within 5 rounds the "enhanced" firing pin broke...

www.theoutdoorstrader.com

 

[Rusty Shakleford]

sail it on odt for 3x it’s value taking the highest offer then buy a rifle anywhere but here and pocket the difference.

 

[Gunny Jake]

All of that plus , see if the firing pin retaining pin Is bent or dragging Against the inside Of the receiver. This Friction would explain The increased kick and failure to cock. Please let us know when you get it fixed and what the problem was.

 

[cmshoot]

My best guess, without seeing it in person:

1. an issue with your FCG

or

2. out of spec bolt carrier, specifically the portion that cocks the hammer

or

3. hammer and/or trigger pin holes improperly located in the lower receiver, causing the parts of the FCG to be out of alignment with each other


OP is saying that the hammer is not cocking when cycling under live fire, not that it won’t fire.

AR’s have a free floating firing pin. A slight dent in the primer of a chambered, unfired round is normal.

 

[wallacem]

OK, I tried another lower. worked fine. I can assume the problem was with the first lower. Will check it out. It is identical to the first one. Wallace

 

[Red Squirrel 556]

Cheap upper on a cheap lower, hurry and fix this problem so you can start working on the next.

 

[cmshoot]

OK, I tried another lower. worked fine. I can assume the problem was with the first lower. Will check it out. It is identical to the first one. Wallace

Issue sounds like what I listed above as option #3.