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Top Adapter Instructions

The Top Adapter just slides in from the top of the receiver.

The adapter should slide in smoothly with a very close fit. The outside dimensions of the adapter are machined to match the profile of a Mil-Spec magwell.

It does not have a bolt actuator built in. You can add a 9mm bolt catch over the top of it for that feature.  A high quality Colt or equivalent part is recommended as poor copies can break.