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This comprehensive Mil-Spec Buffer Tube Kit comes with everything you need to attach your Mil-Spec dimension stock assembly to your lower receiver. Included in the kit are:
A six-position receiver tube precision-machined from 6061/T6 aircraft-grade aluminum, designed to fit most .223/5.56 receivers.
A 3oz Mil-Spec buffer.
A Mil-Spec buffer spring for effective recoil management.
A steel castle nut featuring four slots that can be adjusted with a castle wrench as well as a hole for an older style wrench.
A steel end plate with a dual loop sling adapter for versatile carrying options.