SIG SAUER Pro-Cut Slide Assembly w/X-Ray3 Day/Night Suppressor Sights P320 Sub-Compact/XCompact 9mm Luger 3.9 in Barrel Optic Ready Nitron Stainless. For use with the standard 9mm 3.6in/3.9/4.7 non-threaded or 4.3in/4.6/5.5 threaded barrels. Optic...