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Perfect for your new build or as a direct replacement for worn out parts. M5.308 carbine buffer spring for use in.308 AR's with a collapsible buttstock. M5.308 rifle buffer spring for use in.308 AR's with a fixed buttstock. Made in the USA! Note: Rifle spring will not work with.308 carbines with a collapsible stock. Mfg: Aero Precision.