The Glockmeister grip plug for the 20SF and 21SF is a friction fit unit. It will install on an SF model that does or does not have the lanyard hole. Utilizing tight tolerances that ensure it will never fall out, this plug is easy to install and keeps dirt out of your trigger mechanism. It also helps lead the magazine into the mag well.
Fits: 3rd Gen 20SF and 21SF models only. Does not fit normal frame models.