I was curious as to why you don't recommend NFA .45 Glock lower receivers for your DI uppers.
I have a BB .45 built on a NFA side charging upper and lower receiver that I had you work the barrel to fix the feeding issues (and it works great BTW, I can drop a round in the ejection port and it will chamber when I drop the bolt) but the port noise is so loud that even though I'm running it supressed will hurt the shooter's ears without earpro.
I was hoping to possibly convert it to DI to reduce the port noise until I saw your recommendation against it.