The Picatinny rail (/ˈpɪkətɪni/ or /ˌpɪkəˈtɪni/), also known as a MIL-STD-1913 rail, Standardization Agreement 2324 rail, or tactical rail, is a bracket on some firearms that provides a standard mounting platform consisting of rails with multiple transverse slots similar in concept to the earlier commercial Weaver rail mount used to mount telescopic sights.