Drop the mag, pull the slide all the way back and release. There's a small lever on the left side above the trigger. Swivel it down, then slide the slide off forward. You should be able to push the barrel ahead from below and wiggle it out. That's as far as you need to go to strip it to clean it. You should be able to google a field strip for a real Sig 226 as it comes apart the same way.
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