As others have noted, if you must have a rail (and, though I'm no fan of rails per se, I just installed a light/laser unit on my newer Model 226 utilizing the rails that came with it), buy one that has them. The chances of a late model slide being compatible to the frame of an older SIG 226 is, as Hammerhead pointed out, slim at best.
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ONLY AN ARMED PEOPLE CAN BE TRULY FREE ; ONLY AN UNARMED PEOPLE CAN EVER BE ENSLAVED
...Aristotle
NRA Benefactor Life Member
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