I want to put up a word of warning about the early magazines. This Trailside is an early one. The face of the barrel is flat and at least one of the early magazines would occasionally allow the round being chambered to stop on the face of the barrel below the chamber opening.
The slide would fire the unsupported cartridge and open the case throwing bits of case all over.
WE called SIG - this was the first outing with the handgun and told them about the problem. Sig said it was our problem. This was early digital camera days - none of us had a cell phone at the time. Using dal up we sent SIG these pictures and a picture of the magazine.
Sig sent us a magazine. We still have both. The pistol is accurate but we have had a few safety problems with it.
Check a used Trailside for function before you buy it.
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Slim