It's pretty much a mix of all different stuff so you are better starting from scratch. Email Eric or Steve at Adco and they can give you some options......great guys to talk to. Here are the specs on mine (also known as the Mk12 Mod0 SPR. The Mod1 is very similar....main difference being a KAC float tube in place of the PRI and removal of the ARMS Swan Sleeve).
Rock River Arms National Match Upper & Lower
White Oak/Compass Lake 18", 1/7 twist, SPR profile barrel with fitted bolt, bead blasted finish
Adco SPR compensator
White Oak Precision tuned trigger
PRI Gen III carbon float tube with full bottom rail, matte black finish
ARMS #38 SPR-PEQ2-3 Swan Sleeve
ARMS #40L rear sight
PRI flip up front sight
PRI M84 Gasbuster charging handle
Sierra Precision Rifles grip
Tubb Speedlock recoil spring
ARMS #22 Med. scope rings
ARMS TRR & TRC
Leupold Mk4 4.5-14x40 PR Long Range with mildot reticle
Knights Armament bipod adapter
Harris S-BRM Bipod with Pod-loc and Tanks knob
I do highly recommend the White Oak/Compass Lake SPR barrel that Adco sells. My groups have been under a half inch at 100 yards with 77gr BH blue box. Can't be beat for the price.
Hope that all helps.