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Blem
If you wanted you could bore out the holes in the lower to match and then you can use the JP microfit pins the oversized ones and you should have a very tight fitting rifle That's if you want to do some at home gunsmithing though. I have multiple BCM uppers specifically three of those blem uppers and they all are perfect for me. I also have a Mark 2 fully built upper by BCM and that has zero flaws as well. I use their stripped upper to build A lightweight rifle that ended up only being 5 lb naked. And that thing has such titlerances I absolutely love it
Nothing wrong with the finish or the inside you can make that work and run it
I love these BCM blems.
Lol, check your lower for being in spec. It's tolerance stacking if I had to guess. Bcm is pretty good about quality assurance.
Decent video, but you don’t really know what you’re talking about. It’s not a press fit for the barrels, it’s a heated interference fit. It’s a very common thing done on bearings in the oilfield and on almost all engines. You heat up one part, and the other part will be able to slide in, due to the heated part expanding from heat. All it takes is a hair dryer to get the barrel to slide right in, and when the upper cools it’s a tight, accurate fit. Now on the “rough, blasted” inside of the upper. That’s not rough or blasted. It’s the exact same coating that’s on those gray Teflon usgi mags. It’s good to have it in the upper, helps with lubricity while everything is breaking it, and adds another layer between the raw aluminum and the bolt carrier sliding on it.
Has anything changed since posting? I’ve been eyeing the same upper and wanted to go down this route
I just measured 2 of my Geissele upper receivers and they were the same as you BCM upper +/- 0.0005. Both work with all the lowers I have. Did you end up trying another BCM lower? I have a BCM upper on the way and I am hoping I like it.