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 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 |