SDM Fabricating Red Fiber Optic Front sight for Smith and Wesson Revolvers with interchangeable sights. It is a DX front sight .125W .250H 

Fits all KLN Frame Smith and Wesson Revolver interchangeable front sights.

Models: 610, 686 Performance Center, 686+ Performance Center, 627 Performance Center, 625 Performance Center, 325 Performance Center, 986, Performance Center M&P R8.

The U.S. Arms Export Control Act (22 U.S.C. Section 2778), the International Traffic in Arms Regulations (22 C.F.R. Chapter I, Subchapter M, Parts 120-130), the U.S. Export Administration Act of 1979 (50 U.S.C. App. 2401-2420) and the Export Administration Regulations (15 C.F.R. Sections 730-774) prohibit the shipping of this item outside of the United States.