What devices can fit on the Sig Pro's accessory rail?

The popular Insight Technology M3 (light) and M6 (light/laser) will not, unfortunately, fit on the Sig Pro proprietary accessory rail.

Laser Devices has two devices that will attach to the Sig Pro's accessory rail, a laser and a light. The part number for Laser Devices' Sig Pro laser is 20871, and that of their light is 20872. The manual for the Sig Pro laser is available in PDF.

Here are photos of the Sig Pro laser and light, taken from the Laser Devices web site:

Here are more photos of my own Sig Pro light:

A Sig Pro accessory rail adapter, which conforms to the Picatinny 1913 Rail Specifications, was introduced at the 2003 IWA show. Sure-Fire ended up putting a Sig Pro Picatinny rail adapter into production, for the SP 2009 and SP 2340.

There was a rumor that the Sig Pro's frame would be redesigned later that year to include a Picatinny 1913 Rail, like what happened to the Sig-Sauer P220, P226, and P229. It was implemented in the new Sig-Sauer SP 2022. See FAQ VIII-8 for more details on the Sig-Sauer SP 2022.