Your Gen 4 with no backstraps added is the same size grip as the Gen 3 SF. Glock discontinued the SF and designed the Gen 4 with same dimensions as SF but with ability to add thickness to grips if needed. Just FYI,
Hello
Hello, i will pick it up from you. I am guessing that attachment on the rail is something for the holster? Just let me know how to get in touch with you. Thanks.