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Well, I just pulled the trigger on this one.
I've always built, but I couldn't get this one to pencil out if I did it.
Primarily because I want some QC-10 proprietary stuff which kills the budget.
IMO, they have the most developed Colt pattern lower on the market.
Quarter Circle 10
Rider 9mm AR Pistol
QC-10 proprietary lower (Colt pattern)
VLTOR upper (made for QC-10)
Mil spec LPK
SOB brace
Radian Raptor charging handle
7-1/2" QC-10 barrel
QC-10 M-Lok handguard
(1) Metalform Colt pattern 32rd mag
$1347.46 shipped
Courtney gave me a nice discount which was about $230 off of list price.
Here's an image of their 5-1/2" Colt pattern with Keymod handguard. (Mine's 7.5" and M-Lok)
View attachment 518491
Quarter Circle 10 Rider 9mm Pistol
https://www.quartercircle10.com/media/manuals/RIDER MANUAL REV A.4.pdf
Nice!!! When you get it, and I get mine we will have to go shoot a 1000 rounds!