This replacement magazine is a factory original from Ruger. Factory replacement parts are manufactured to the exact same specifications and tolerances and use the same manufacturing materials as the original parts which guarantees excellent fit and reliable operation. Keeping a few extra factory magazines around is never a bad idea; extra magazines save loading time at the range and also serve as a backup for those days when you simply cannot remember where you put your primary magazine.This 20-round, single feed magazine fits rifles chambered in 308 Win, 7.62 NATO and 6.5 Creedmoor. 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 a T-360 total coati...