Gas starts with the ammo/round that’s fired. I second the opinions of don’t drill until you’ve tested full factory ammo.
I’m having a similar issue and was using UMC ammo. Before buying anything, I’m going to try quality ammo.
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Gas starts with the ammo/round that’s fired. I second the opinions of don’t drill until you’ve tested full factory ammo.
I’m having a similar issue and was using UMC ammo. Before buying anything, I’m going to try quality ammo.
As I indicated in my OP - I've shot a lot of this ammo over the years - it was out training ammo at work, since I retired I've had to buy my own, but I'm well on my way to filling a second five gallon bucket with brass from this manufacturer.
I don't plan on using the rifle for 5.56 or suppressed, so I'll figure it out and get it to run.
Mil spec gas tube and not something undersized and out of spec?
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Thanks all for your suggestions.
Fixed it.
The BCG I was using was a semi-auto one I built from a kit provided from Brownell's years ago. As I mentioned in my OP, it functioned fine in the 16inch carbine length upper I tore down to get my favorite MI rail off of for this build.
When I first had problems I did the standard 'will the bolt carrier descend upon it's own weight' check for the gas rings and examined the gas/carrier key for signs of venting - nothing.
Anyways, I thought maybe the miniscule difference in weight might make a difference, so I took a new Toolcraft out of the parts hoard and it works fine - did numerous lock back checks, did a rapid fire mag dump, and then zeroed the rifle at 100 yards and shoot the rest of 3 mags at 100 and 200 yard plates.
I did not take another rifle out to see if the BCG worked in it, but this BCG came out of the first rifle I built, and it has one my heaviest used rifles. It functioned fine.
Oh, well. I'll check tomorrow with the semi-auto carrier in another mid-length to see if it functions.