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.

New frontier lowers are problematic at best with a DI upper...It can be done but you have to make a new mag catch and fabricate an over insertion stop to prevent the mag from pulling up when feeding. You'll also have to mod the mag followers to keep them form hanging on the locking lugs.
If you want DI.....the best route is my mag and adapter.....OR a CMMG large frame Banshee lower as Black Creek and Angstadt are no longer available. Havent been able to confirm yet....but it appears that QC10 is a thing of the past as well.Another option is WOlfpack Armory....I need to sit down with Joe and nail down the mods so he can produce a DI45/10mm ready lower. Glad you posted this...I'll give hom a call this week and see if we can get the ball rolling.