I have a 24", stainless, fluted, barrel now. I'd like to go 18 or 20". Who's got barrels out there? Everywhere I go, there are just 223/556, or 300 BO barrels.
If you watch you may be able to find an 18 inch barreled upper reasonble. then you pop 2 pins, change the bcg and have 2 set ups for different needs. that is what i am planning on with mine, and have done it with an ar 15 platform, I would stay away anything much shorter than 18 unless you are able to "can" it. they get obnoxious fast.
I just put a Juggernaut tactical 18in fluted 5R on my PSA build. I put a CF forearm. Rifle is 8# with scope and mag seems to be very accurate with Fed fusions and FMJ.