This is a factory detachable box magazine for the FN Ballista rifle series. Made of advanced reinforced polymer materials, it has a stainless steel spring and holds eight rounds of .338 Lapua Magnum ammunition. Since it is a factory magazine, you are assured of receiving the same quality construction and reliable operation as the magazines originally supplied with your firearm. Features FN 3703013381 .338 Lapua Magnum 8 rounds capacity Stainless steel spring Polymer body Flat dark earth