The UIT rail, also known as Anschutz rail, is a standard used for mounting slings and other gun accessories in competition shooting, and is essentially a T-slot track shaped aluminium extrusion profile accepting attachments in the form of T-slot nuts, or similar.[1]
A similar design is called Freeland rail, but the dimensions of Anschütz (UIT) and Freeland rails differ.[2] The Anschütz rail is wide and shallow,[3] and the Freeland is narrower and deeper. Accessories made for one of the two types are not necessarily compatible with the other.
Dimensions
Dimensions below are approximate.
| Description | Anschütz (metric) | Anschütz (imperial) | Freeland (metric) | Freeland (imperial) | |
|---|---|---|---|---|---|
| A | Internal width of opening | 10 mm | 0.400 in | 8.4 mm | 0.330 in |
| B | Internal width bottom | 13 mm | 0.512 in | 11.4 mm | 0.450 in |
| C | Total internal height | 4 mm | 0.160 in | ||
| D | Internal track height | 2 mm | 0.079 in | ||
| E | External height | 7.4 mm | 0.290 in | 10.2 mm | 0.400 in |
| F | External width | 22 mm | 0.870 in | 16.3 mm | 0.640 in |
Drawing comparing Anschütz (left) and Freeland equipment rails (right).
See also
- Rail Integration System, generic term for a system for attaching accessories to small firearms
- Weaver rail mount, early system used for scope mounts, still has some popularity in the civilian market
- Sling swivel, older standard used for mounting slings, particularly on hunting firearms
- Picatinny rail (MIL-STD-1913), improved and standardized version of the Weaver mount. Used for both for scope mounts, and for accessories (such as extra sling mounts, vertical grips, bipods etc.) Major popularity in the civilian market.
- NATO Accessory Rail- further development from the MIL-STD-1913
- KeyMod - open standard design to replace MIL-STD-1913 for mounting accessories (except for scope mounts)
- M-LOK - free licensed competing standard to KeyMod
- Zeiss rail, a ringless scope mounting standard
References
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