Features: Six position AR-15/M16/M4 receiver extension assembly Includes Mil-Spec receiver extension/buffer tube, receiver lock plate, lock-nut/castle nut, carbine buffer and carbine buffer spring Buffer tube is Mil-Spec diameter and 6061 aluminum Carbine buffer weight is 3 oz Buffer spring is 17-7 stainless steel Mfg: Brownells Fits standard AR-15/M16 lower receivers. Mil-spec diameter. Includes buffer tube, lock plate, castle nut, buffer and buffer spring.
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