S&W 15-22 Magazine Adapter (Clip on)$7.50
The AR Catch22 clip-on magazine shim can clip right onto your lower for a quick and easy way to shim the magazine and take up the slack in the mag well. The clip is easy to install and remove and it allows you to use your standard 15-22 magazines in your AR without any modification.
With the 15-22 magazine adapters, the S&W 15-22 magazine will work great with the Catch22 to provide true last-round-hold-open functionality.
One adapter is needed per lower.