https://www.bor2llc.com/in-store/new-long-guns-3783/ruger-ar-556-semi-automatic-223-remington556nato-161-barrel-type-iii-hard-coat-anodized-black-finish-6-position-stock-m-lok-handguard-1-30rd-magazine-3621539 

Manufacturer: Ruger
Manufacturer Part #: 8529
Model: AR-556
Action: Semi-automatic
Type: AR
Caliber: 223 Remington
Caliber: 556NATO
Barrel Length: 16.1"
Finish/Color: Black
Grips/Stock: 6 Position Collapsible Stock
Hand: Right Hand
Accessories: 1 Mag
Type of Barrel: Threaded
Type of Barrel: 1:8
Capacity: 30Rd
Description: MLOK
Subcategory: Modern Sporting Rifles