I have two ARs as you'll see in the pic below.
At one time I considered going the SBR route and adding one to the stable. Although they are really "cool" and serve a purpose, looking past the want and coolness, I really don't need
My current considerations.
The Noveske Light Recce Lo-Pro with the Leupold in the pic is my DM setup and has prompted what I'm now considering. The main round for this gun is PPU 75 gr BTHP Match ammo. If I do my part I get 1.25 to 1.5 MOA. I'm good with that. What really made me happy was that it will also shoot 55 gr M193 PPU/IMI to the same POI. Hell yeah!
The S&W is what I consider my CQB weapon and was my first AR. It is light, I shoot it really well and have no regrets buying it. It now has 2,000+ rounds out the tube without any problems. I mainly shoot M193 ammo out of it. It will not however shoot the PPU 75gr better than 4 to 5 MOA. This is really no surprise due to the 1:9 barrel twist.
I bought the S&W in the summer of 08 and paid too much for it. If I ever considered selling it, I'd never get close to what I paid for it unless a AWB is dropped on the table.
I'd like to swap-out the 1:9 barrel for a 1:7, 14.5" lightweight mid-length barrel with a pinned FH. I believe I could do this myself and I'm willing to drop the money on the tool(s) to do it.
If you notice, I have a AAC 51T Blackout on the Noveske. A AAC M4-2000 is in my future and will most likely be my only NFA investment and would like to use it on both guns.
Can a AAC 51T be pinned to a 14.5" barrel and still utilize the suppressor? I'm not sure but don't see why it couldn't be.
Would there be any problem with the gas block being exposed with the 10" Troy MRF? I think not but would like verification.