SIG-516 Piston Driven AR-15 Upper Receiver Assembly w/Bolt and Carrier, Charging Handle, Adjustable Gas system, Quad Rail, 7.5" Barrel 1/7 Twist, 5.56 NATO *Very Good*

SIG 516 Piston Driven AR15 Upper Receiver Assembly, adjustable gas system, bayonet lug, 1 in 7 RH twist, 7.5" Barrel length, factory quad rail, 5.56X45 in *Good* condition.

Sold Individually.
These operate with an adjustable gas piston instead of direct gas impingement.
Includes upper receiver, barrel, sights, bayonet lug, charging handle and complete bolt assembly.
Factory free-floated aluminum M1913 quad rail system provides an uninterrupted top rail.
SIG 516 barrels are chrome-lined hammer forged featuring 1:7 RH twist with Nitride finish.
The muzzle is threaded 1/2″x28 for flash hiders or other types of muzzle devices.
Gas block push-button lock for adjuster may require cleaning/servicing for proper use.
These uppers will have some siezed and grimy parts that will require cleaning.
May show signs of finish wear, rust, marring, etc..

NOTE: Prior to installing this length of barrel into a rifle a NFA Form 1 must be completed and returned approved.
A 7.5 Inch length barrel installed into a shoulder fired firearm is a "Short Barreled Rifle" under the NFA. 

Parts must be inspected and tested by a qualified and competent gunsmith or armorer before use in a firearm.
Not all firearm parts are interchangeable; use of new parts without proper knowledge could cause a firearm to malfunction and cause property damage, injury or death.