Firearm bolt-striker assembly including a bolt handle and power spring
作者： Vartanian Edwin S , Kulikowski Victor Alexander , Badali Joseph A
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lens.org 参考文章(3)
Gerald I Hurley, Rifle bolt and sleeve for a receiver having an oval bore ,(1962)
Mcclenahan Douglas Sloan, Recoil-action machine gun ,(1956)
Thomas C Johnson, Bolt-action firearm ,(1919)