can't get 90% lowers any more? years ago I kicked around the idea of suppressed carbine, would love to have a suppressed SBR/pistol in a 50AE cartridge...is such a thing a thing?80% lower
So me personally, I wouldn't go with a proprietary platform, I'd get a regular ar15 patterned lower and then put an integrally suppressed upper to go with it if that's what you want. If it was me I'd go with something that would be sbr/pistol length, and build the 80% lower as a pistol lower. When you have a can you can cross state lines with it as long as it's legal in the other state. If you were to get an sbr you'd have to get permission ahead of time to take that rifle across state lines. A suppressed Ar15 pistol does not have that problem.