Bolt conversion apparatus for firearm and upper receiver for the same

Abstract

An upper receiver for the one family of firearms allows for the use of a bolt of another firearm family in the firearm action. In the depicted embodiment, an AR-15 bolt and its carrier group are simple drop-in with only the addition of a sear plate, clamp, and an insert into the bolt carrier group. The depicted receiver is designed to also prevent its use on the semi-automatic variants of the MAC family.

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