
1) Firearm component
Found on
https://www.crosswordclues.com/clue/picatinny-rail

a bracket used on some firearms in order to provide a standardized mounting platform.
Found on
http://en.wikipedia.org/wiki/Glossary_of_firearms_terms

The Picatinny rail (i or i), also known as a MIL-STD-1913 rail, STANAG 2324 rail, or tactical rail, is a bracket on some firearms that provides a standard mounting platform for accessories and attachments, similar to the Weaver rail mount. == Design == The rail consists of a series of ridges with a T-shaped cross-section interspersed with flat `s....
Found on
http://en.wikipedia.org/wiki/Picatinny_rail

A metal bar, available in a variety of lengths, with a continuous row of Weaver-like scope mount base slots, which when attached to a firearm, allow convenient attachment of a variety of sights, lights, slings, bipods and other accessories.
Found on
http://www.hallowellco.com/abbrevia.htm
No exact match found.