[omega4179]

The manual states this:
“AMMUNITION (580 series mini14 and above)
The RUGER® MINI-14® RANCH RIFLES are chambered for the .223
Remington (5.56mm) cartridge. The Mini-14 Ranch Rifle is designed to use either
standardized U.S. military, OR factory loaded sporting .223 (5.56mm) cartridges
manufactured in accordance with U.S. industry practice.”

[NoLibZone]

Is the receiver stamped 5.56 MM ?