Weaver/Picatinny rail mounting sights

 

— mounting on a standard Weaver or Picatinny rail — a T-profile “rail” with special slots. These types of slats are similar in design, they differ only in the size of the slots; moreover, these differences are such that Weaver rail accessories usually fit Picatinny rails without problems, but not vice versa. Thus, most modern sights provide Weaver mounts — as more universal. However, exceptions are possible, so it's ok to clarify the specific type of fastening before buying.