$440.
Need the lower for a 5.45 SW upper I just bought.
Here are the specs from aim surplus which is where I bought it from. It has not been abused.
Specifications:
Spike's Tactical M4 flat top upper receiver, Machined from a 7075 T6 Mil-Spec Forging with Mil-Spec Type III Hard coat Anodized finish, T-markings, Spike’s logo and M4 feed ramps.
Barrel is certified MIL-B-11595E CMV, M4 barrel extension, Chrome chamber and bore, 5.56mm Nato chamber, 1:7 Twist, Magnetic particle testing on every barrel, Phosphate finish.
Government Contour barrel with mid-length gas system.
Barrel is Phosphate finished under the .750" F marked A2 front sight base.
The M16 carriers are Chrome lined with a Mil-Spec phosphate finish.
Forged Mil-Spec carrier key, Chrome lined, attached with Grade 8 hardware and Properly staked.
HP/MP Tested Bolt, Each extractor is fitted with a Mil-Spec black insert and Mil-Spec Viton o-ring.
Magpul MOE heat shield lined black handguards.
A2 Flash Hider.
Stock aim surplus picture: