Black Rifle BCG Question

[Cureforcancer]

About a month ago i started another Ar build.
I decided to use a very low cost BCG (bear creek arsenal) and yes i KNOW the consquences of cheap parts (save it)...BCG $55 bucks on "sale" Primary Arms.

Build went perfect...installed the bcg...rifle past the "manual function test"... well some what ....except when i dry fired the weapon. The bolt was STUCK and i mean STUCK. It took a very considerable amount of force to pull back the charging handle in order to disengage the bolt but only after the rifle was dry fired. I tried 3 different BCGs and no problems. Obviously the issue was the bcg. I wanted so bad to take apart the bcg but doing so...i would'nt have been able to return it and get a replacement. I returned it and all is well...but my question Is....what was wrong with the bcg? Stuck and i mean stuck ONLY when dried fired. At the time i reseached it online and found no answers. AR BCG experts chip in.

 

[MilesTeg]

It might have been the bolt itself. I would have removed that and seen if the bcg would cycle without it. This would tell you were the hang up was.

 

[Cureforcancer]

It might have been the bolt itself. I would have removed that and seen if the bcg would cycle without it. This would tell you were the hang up was.

Out of spec? Which part?

 

[NY Leatherneck]

It might have been the bolt itself. I would have removed that and seen if the bcg would cycle without it. This would tell you were the hang up was.

This ^^^^^
Could be the bolt coating was too thick as well. You said the function test was fine. Assuming it was well lubricated did you still feel the friction was abnormally rough for a new build?

 

[Cureforcancer]

This ^^^^^
Could be the bolt coating was too thick as well. You said the function test was fine. Assuming it was well lubricated did you still feel the friction was abnormally rough for a new build?

The friction felt normal. Ran dummy rounds while cycling the bolt. All was well....except when dry firing. The bcg was blued...i doubt the finish had anything to do with it. I used synthetic gun oil lightly prior to inserting the bcg and tons after. I also did not notice no unusual wear marks on both the upper or the bcg.

 

[MilesTeg]

Out of spec? Which part?

In case you weren't following my comment don't take this as insulting what you know. A bolt carrier group (bcg) is made of two primary components a bolt and the carrier. The bolt is the piece in the front that twists and pops in and out.

So if you removed the bolt and reinstalled just the carrier in the rifle and hand cycled. This would tell you if your problem was with the carrier or bolt. If it still bound up without the bolt you have a problem with the carrier. If it cycled freely then you have a problem with your bolt or barrel extension.

Considering you tried other bcg in the rifle you can rule out a problem with the barrel extension.

 

[NY Leatherneck]

Did you dry fire with other bcg?

 

[Cureforcancer]

In case you weren't following my comment don't take this as insulting what you know. A bolt carrier group (bcg) is made of two primary components a bolt and the carrier. The bolt is the piece in the front that twists and pops in and out.

So if you removed the bolt and reinstalled just the carrier in the rifle and hand cycled. This would tell you if your problem was with the carrier or bolt. If it still bound up without the bolt you have a problem with the carrier. If it cycled freely then you have a problem with your bolt or barrel extension.

Considering you tried other bcg in the rifle you can rule out a problem with the barrel extension.

Ahhh...i see what you are saying.
That clarifies alot.
Too bad i did not take it apart and find out.
So in your opinion...let's say the the bolt was defective...is it possible for the bolt to jamb in such away?

 

[Cureforcancer]

Did you dry fire with other bcg?

Yes. No issues. Just with that one BCG.

 

[MilesTeg]

Ahhh...i see what you are saying.
That clarifies alot.
Too bad i did not take it apart and find out.
So in your opinion...let's say the the bolt was defective...is it possible for the bolt to jamb in such away?

I'm not expert I'm still trying to figure out a light primer strike on one of my AR's. But yes it would have been just a bolt issue. You could have a coating issue(too tick), you could have a milling issue (bolt not made to spec) or you could have had a bolt to carrier issue (bolt didn't mover freely in the carrier group sometimes a result of bad gas rings ). It's a hard thing to diagnose of the internet without getting hands on.