This 5-round single-feed magazine fits the Ruger American Ranch Rifle and AR-556 MPR platforms chambered in .350 Legend. The 410 stainless steel body provides strength and durability while the POST & HOLE adds strength, durability and robotically-welded precision. The mags LIPLOCK technology keeps rounds secured and aligned. The Advanced Geometry Follower remains level for consistent feeding while the EVERFLEX anti-fatigue spring technology ensures long life and reliability. The magazine is finished in T-360 total coating technology for enhanced performance & cleaning.