One factor that may be coming into play is how well lubed or dirty the gun is. I have an older 308 build (2012) with an SLR adjustable gas block. I learned that the gas block could be closed several clicks (don't remember exactly now) when I used a NiB (yeah I know) BCG and an extremely slick mixture of Tetra and Slip2000 lubes. I've noticed a similar change in other rifles since then when using that lube mixture.
As to BRT, amongst several of their products, I also have one of their gas block inserts from a few years ago. I purposely ordered it 2 sizes smaller than what Clint recommended, and I bought the next 2 sizes drill bits. I was actually able to get the rifle to cycle with full bore 5.56 using the insert I ordered, but decided to drill one size larger to be able to cycle Russian steel, in order to give myself some leeway. Still nervous about that particular BCM being potentially undergassed to this day. Though I've never had an issue with it.
ETA: Forgot to add that once you've eliminated any potential issues with the rifle, you can always drill the port in the gas tube one size larger.
Last edited by georgeib; 09-15-22 at 08:04.
“You have made us for yourself, O Lord, and our heart is restless until it rests in you.” -Augustine
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