Here are the specs for my little 9mm AR SBR. It is a lot of fun at the range. Glad that you are impressed Manticore Arms. Means a lot coming from you.
Quarter Circle GSF lower (Glock magazines)
4.5 inch barrel (forgot the manufacturer actually, but got it at a local gun show)
Muzzle device was recently bought at a local gun show, no info on manufacturer but knew that I had to have it when I saw it
Anderson semi-slick side
Strike Industries Viper stock
Magpul MOE forward grip
Pearce AR-15 Grip Adapter with Punisher side panels
Black Spider Optics red-dot with riser
ETS 33 round magazine
and the best for last...
Franklin Armory Binary Firing System trigger.
The Black Spider Optics red-dot is not bad and has never given me any issues, but it is just not doing it for me. I think that I am going to have to go with an Aimpoint Micro.
Other than that, I am pretty happy with it.