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Gunsmithing BAR MK3 DBM Help

VandelayIndustries

Gunny Sergeant
Full Member
Minuteman
Jan 20, 2022
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Obviously I’m not a gunsmith that’s why I’m here seeking help.I have a newer BAR MK3, with an adjustable gas block.

So I found a good video on how to completely disassemble a BAR. I did that cleaned it in an ultrasonic parts cleaner (parts that would fit). While it was apart I spray painted the barrel only. I taped the gas block off really good multiple layers as not to get paint in there. Reassembled, function test. Everything was good. Then test fired, goes bang like normal but won’t eject. I thought maybe it was the gas block that needed tuning even though I didn’t touch that at all. So I went from tight all the way out to 8 full turns in 2 full turn increments (10 full turns is max). All fired none ejected. So now what? Or what did I fuck up?

Edit: I’ll add that before I took it apart it would cycle whatever ammo I threw at it flawlessly. Never had a single failure to eject or short stroke. Probably 300 rounds down the barrel.
 
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Without pics and videos of not cycling, this may need a crystal ball.

The cleaning, painting and gas block are all suspects.
here’s what I have for now. I could try to take a video tomorrow. It seems to me the bolt isn’t moving rearward at all or a very small amount.
 

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When you painted the barrel, any chance you plugged the port with paint? Not familiar with this firearm, but probably requires gas to unlock the bolt.
 
When you painted the barrel, any chance you plugged the port with paint? Not familiar with this firearm, but probably requires gas to unlock the bolt.
I guess anything is possible but I double wrapped the gas block with painters tape so I doubt it. I don’t see any paint on the block when I pulled the tape. But it’s obviously not being forced open when fired
 
So as an update I figured it out. Before I took it all apart I took the front swivel stud out and plugged the hole with wax so water wouldn’t get in. I took it apart did everything put it back together and didn’t have the wax or the stud in. Turns out the swivel stud actually screws down into the front of the gas block. That’s where all the gas was going not allowing it to cycle. Pretty simple. Kinda a rookie mistake on my part but figured I’d update this in case anyone runs into a similar issue.
 
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