https://vizardsgunsandammo.com/ruger-8500-ar-556-223-rem5-56-nato-16-10-30-1-black-hardcoat-anodized-black-6-position-stock/
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Ruger's AR-556 semi-automatic rifle is made from froged aerospace-grade 7075-T6 aluminum. The hard coat anodized flattop upper receiver includes a forward assist dust cover and brass deflector while the handguards are made from heat-resistant glass-filled nylon. It has a carbine-length milled gas block with multiple attachment points for a QD socket bayonet lug and sling. Serrations on the angled face of the gas block provides a low-glare surface. The Rapid Deploy folding rear sight provides windage adjustability and the front sight post is elevation adjustable and includes a front sight tool. The A2-style F-height allows co-witness with many optics. It also has a bolt machined from 9310 alloy steel single-stage trigger chrome-plated bolt carrier with a matte black oxide finish on the exterior and patent pending barrel nut and Delta ring for one person handguard removal and installation.This model has a black six-position buttstock and handguard and a Magpul PMAG.

RUG*8500 AR556 223 16 FLD 30R BLKSYN
Mfg Item Num: 8500
Model Number: AR-556
Purpose: Personal Protection/Sport
Series: Autoloading
Unit of measure: GN
Action: Semi-Auto
Caliber: 223 Rem5.56 NATO
Barrel Length: 16.10
Capacity: 30+1
Trigger: Single-Stage
Safety: Lever
OAL: 32.25-35.50
Weight: 6.50 lbs
Stock Description: 6 Position
Muzzle: Threaded
Receiver Material: Aluminum
Sights: A2 Front Rapid Deploy Folding Rear
Barrel Description: Cold Hammer Forged
Twist: 1:8
Barrel Length Range: 16.00 to 16.99
Weight Range: 6.00 lbs to 6.99 lbs
Hand: Right
Stock Finish Group: Black
Metal Finish Group: Blued/Black