Base plate adaptors for accessories

An adaptor for an accessory attachment system comprises a body having a first side and a second side opposite of the first side. The first side has a first mounting configuration that is configured to be received within a first pattern of apertures on a base plate. The second side has a second mounting configuration that is different than the first mounting configuration such that an accessory having the second mounting configuration configured to interact with a second pattern of apertures different than the first pattern of apertures can be mounted to the base plate via the body.