Q: What guns will the ADP-S637-140 fit on?
A: The ADP-S637-140 will only work on the Smith & Wesson J-Frame Model 637 and the Smith & Wesson J-Frame Model 642.
Q: What lasers or additional accessories will fit on the ADP-S637-140?
A: FSR-00V2-140, FSM-00QD-140, LRS-0650-SSW, FSL-0650-140, LL-1 and WL-1.
Q: How does the ADP-S637-140 stay in place?
A: The ADP-S634-140 has two sides that fit over the barrel lug. It is then held in place with two screws.