https://mariustactical.com/product/ruger-ar-556-sem…nato-16-1-barrel/

Additional Information
Model Number: 8507
Caliber: 5.56 NATO / 223 REM
Stock: Flat Dark Earth Magpul® Synthetic Collapsible
Front Sight: Adjustable Post
Rear Sight: Adjustable Ruger® Rapid Deploy
Barrel Length: 16.10″
Thread Pattern: 1/2″-28
Handguard: Flat Dark Earth Magpul® MOE® M-Lock
Pistol Grip: Flat Dark Earth Magpul® MOE® AR15 Grip
Twist: 1:8″ RH
Capacity: 30
Finish: Type III Hard Coat Anodized
Height: 8″
Weight: 6.5 lb.
Overall Length: 32.25″ – 35.50″
Length of Pull: 10.25″ – 13.50″