Top rail for the SIG 55x series rifles that do come only with the diopter sights and no top rail for mounting optics. The short B&T mounting rail for the SIG assault rifles 550/551/552/553 as well as for their civilian counterparts is the perfect base for mounting any kind of optic.
 
12 slot picatinny rail
fits SIG 55x pistols/ SBRs/ rifles with only diopter sights
One top screw to torque down rail set
made by SB&T Switzerland
made in Switzerland