Ar15 gas block leak

[greyling22]

So i built a blackout sbr ar. Ballistic advantage barrel and gas tube, wojtek adjustable clamp on gas block. Never used wojtek, but they like him on Reddit.

Anyway, I'm shooting today for the first time and I'm getting carbon blown out of the gas block, through the handguard and in my hand. Never had this happen before. So I took it apart and this is what I see. (Attached pictures) how concerned should I be? Will it foul shut eventually? Why is the nitride gone off my barrel?

I cannot seem to get the thumbnails to link right. Below are the image urls.


https://ibb.co/SvfxBKw
https://ibb.co/Czgd43K
https://ibb.co/vqdqZGR
https://ibb.co/GCRfc1J

 

[troy fairweather]

if u have calibers measure the barrel and the block maybe one is out of spec. or maybe the gas hole is not lined up all the way with the block.

 

[Varminterror]

Is the clamp closed at the bottom? Meaning it can’t be tightened any further?

 

[greyling22]

it is/was not closed all the way. that said, it is/was plenty tight. and held on with three clamping screws.

Gas block area of the barrel measured .750-.752, depending on how tight I clamped down on the calipers. I couldn't find my micrometer.

 

[troy fairweather]

check for burr on the block hole, tighten the middle screw first then the others. maybe a little tighter on the screw torque.

 

[Cokeman]

Are the clamp on type or the type where the screws tighten into the barrel (dimple) better? Or the same?

 

[ARguy555]

It’s possible that you just knocked the gas block out of position while shooting. That’s a problem that can happen sometimes when using a gas block that doesn’t use a set screw which tightens to a dimple on the barrel.