Not sure of the exact model, but if this is the "Sigma"...this is it.
Remove the magazine and rack the slide, verify chamber is empty.
Point in a safe direction and pull the trigger.
Grip the slide and pull back about .5 inches.
There are two small tabs sticking out on either side of the frame, above the trigger. Pull both of these down at the same time. While holding them down, push the slide forward and it will come straight off the frame.
You can now remove the spring and barrel from the slide.
That's it.
To put it together, reassemble slide, hold in front of frame, align rails, pull slide all of the way back (like chambering a round) and release.
