For you consideration. - Unfired Condition for both items.
ITEM 1
10.5" Cold Hammer Forged Barrel, 1 in 7" twist, 5.56mm
–Made of Mil Spec M249 Machine Gun barrel steel, with heavy M249 Chrome Lining, (appx. 2 times as thick as an M4 or M16)
–Extended Feed Ramps
–Mil Spec Phosphate finish
–MP HP tested barrel
–Carbine length gas system
–LaRue Gas Block
Price - $450 Shipped
ITEM 2
The 10.5" MRP Barrel
10.5" CHROME LINED
1:7" TWIST 5.56 BARREL ASSEMBLY FOR MONOLITHIC RAIL PLATFORMS
Price - $325 Shipped.
Paypal +Fees or Money Order.
plrysztofiak at gmail.com
Thanks for looking. 
Paul