I've a SPR-ish type rifle for sale. It's built with some pretty good parts.
The lower receiver is a new Stinger, made by Mega Machine.
Upper- New Olympic Arms A3
Bolt/Carrier Assembly- New Olympic Arms Blak-Tak
Trigger- Rock River Arms 2-Stage
Barrel- Kreiger 1-7.7 Twist Stainless (used, excellent, guages well).
FA Enterprise Free Float Tube
Front sight- Flip up Yankee Hill Machine
Rear Sight- Matech BUIS
Flash Hider- Brennan Nil-Flash
Stock- Ace Ltd.
KMC Verticle Pistol Grip
About the only used part was the barrel, and it still has a lot of life left. I've not shot it since it was assembled, but it sure looks good!
Price is $950. Shipping is $15. Will ship with an HK Maritime Magazine
Please check out this link
for more pictures.