An innovative, yet inexpensive adaptor allowing the use of the excellent and easy to load Smith & Wesson .22 Rimfire magazines in a standard AR15 lower receiver when coupled with a .22 Rimfire conversion unit or dedicated .22 Rimfire upper. The adaptor block is simply inserted into the magazine well and kept in place by a spring loaded friction plunger. It only takes seconds to install and is quick and easy to clean. The bolt locks open when the magazine is empty and can be locked open with the rifle bolt catch.
Specs: CNC machined from 6061 aluminum alloy and case hardened 1018 steel.