My work in progress. Mocked it all up the other day. Well, laid it out anyways. Sort it's not a "complete" SBR but you get the idea of how it will look.
Still missing barrel, upper/lower parts kit, and some other odds and ends.
Parts list as of now:
Stripped Aero Upper/Lower
Troy PDW Stock Kit
Troy 5.56 Claymore Muzzle Brake (linear comp)
SLR Ion 8" Lite MLOK Rail
Colt charging handle (6920 takeoff)
Magpul MOE K2 Grip
Magpul MLOK MVG
Magpul Enhanced Trigger Guard (Aluminum)
Still need:
Aero Precision/Ballistic Advantage 7.5 barrel
SLR Sentry adjustable gas block
White Oak Armament lower parts kit with ALG QMS or Combat trigger
BCM Gunfighter charging handle - small latch probably
Dust cover and forward assist
IWC MLOK Handstop
Front/Rear BUIS - Will probably go with a set of MBUS Pro's
Aimpoint T1/mount (come on Eotech refund!)
Surefire M300 Mini Scout w/ low pro 45 degree offset mount
I'm sure I've forgotten some stuff and parts are subject to change but it should be a cool little blaster when it's all said and done.
Edit: Oops, just realized OP was looking for SBRs
under 7.5 inches. My bad.