This guide details the straightforward process of installing a CMMG .22 conversion kit into a CMMG BR4 rifle. It involves removing the standard 5.56 bolt carrier group and charging handle, then inserting a specific adapter and the .22 conversion kit into the upper receiver. A crucial step for the BR4 lower is the installation of a provided spacer to properly seat the conversion kit, which differs from standard AR-15 lower receivers.
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