Upper: RAA 9mm.
Magwell Adapter. Hahn.
Gas block: Brownell's to replace A4 sight with a detachable sight.
Lower: JD Machine.
Light spring on stock trigger: JP Ent. Trigger needs to go to Springfield.
Ambi Safety: RAA.
Buttstock: Magpul CTR.
Magazines: C products and RAA. Both work well.
Rings: EGW 30mm.
Scope: Millett DMS 1-4x with illuminated reticle.
Holds about 1.25 inch at 50 yards with Magtech ammo. Haven't had the chance to try any other or load for it yet. Great fun. I really like this gun.