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What use is a replaceable magazine if you don't have the spare? This is an essential accessory for your AR-30. Steel 5 round magazine for the .338 Lapua Magnum and .300 Winchester Magnum caliber Ar-30 rifles.
Magazines springs for the AR-10, M-15, and AR-30 - Stainless steel, type 17-7 pre-hardened ASTM A313
