Mine is an 8.5” barreled AR based SBR, I’ll see if I can get some pictures posted of it. I’ve been shooting the 125gr SST for supersonic loads and the 220gr Sierra RN for subsonic, both loads using Lil’gun. I only shoot it suppressed.

On the flip side, I have a Desert Technology SRS A1 Covert with the 16” factory .308 barrel (1:8” twist). I’ve had good success shooting subsonic loads using the 200gr Lapua subsonic bullets and Trailboss.