Spike's Tactical 16" 5.56 M4 LE Complete AR-15 Upper - with Front Sight Base

The Spike's Tactical 16" 5.56 M4 Carbine Complete Upper offers the same level of quality and performance available in all their rifles. Spike’s Tactical maintains a high standard of tolerances and attention to detail in the uppers they use for complete rifle builds. Every complete upper is test fired before leaving their facility and is backed by Spike's Tactical lifetime warranty.

Features:
7075-T6 forged aluminum upper receiver. 
Forward assist and ejection port door.
16" 5.56 NATO, chrome lined, M4 profile barrel with carbine length gas system.
41V50 chrome moly vanadium steel with a phosphate coating.
1/2x28 thread pitch with a 1:7 twist rate.
M4 feed ramps.
Pinned A2 front sight base.
Double heat-shielded M4 handguard.
Standard charging handle.
Phosphate coated, M16 cut, complete bolt carrier group.
BCG high pressure tested and magnetic particle inspected.
A2 flash hider.
Weight: 4 lbs 2 oz.