The Picatinny rail (MIL-STD-1913) is the dominant standardized rail interface on modern rifles and many pistols. Its consistent slot width and spacing let optics, mounts, and accessories from countless brands attach interchangeably.
Also called MIL-STD-19131913 railPic rail
The Picatinny standard at a glance
- Type
- Rifle & optic rail
- Key spec
- 0.206 in (5.23 mm) slot width, standardized spacing
Compatibility
Picatinny is the near-universal rail standard for optics, mounts, lights, and accessories. Most Weaver-pattern accessories fit a Picatinny rail, but Picatinny accessories often do not fit narrower Weaver rails.