Remove the magazine, clear the chamber. Remove the front swivel/forend screw.
Pull the bolt all the way to the rear and hold it there while you push the barrel upward out of the forend. This should seperate the stock from the barrelled action.
Look at the bars on the operating slide. See the small half-moon cutouts? Slowly pull the operating handle to the rear until you can see the pin lined up with the cutouts. Push that pin out. Be careful here, as this will release the trigger housing assembly which is under spring tension. This also will release both the inner and outer operating springs and their guide. BE VERY CAREFUL not to bend or spring out the bars on the trigger guard housing - if you do the mag will never seat right again. Set all this aside.
Back to the barrelled action. Remove the spring clip from the gas plug sleeve that keeps it attached to the gas block. Unscrew the gas plug which will release the gas cylinder. Slide the assembly back, and remove the gas cylinder to the front. The operating slide assembly and bolt will now remove upward and to the rear.
The bolt is held to the operating slide by a single pin near the rear of the bolt.
Look for the firing pin retaining pin toward the rear of the bolt. The firing pin and its spring removes toward the rear. There is a very small transverse pin toward the front of the bolt that seperates the bolt from its slide.
My dad has a M-100, we took it to a gunsmith to have it broke down and cleaned before deer season, after deer season I was going to clean it I pulled the bolt back but not far enough to catch the magazine when I tried to pull it back again it would only come back about a 1/4"took it back to the guy who cleaned it before season, we tried putting a wooden dowel down the barrel and hammering it open no luck he said the only way to get it apart was to cut the stock off. We decided to send it back to Win. they repaired it but never said what was wrong with it, they replaced alot of parts in the bolt. The only thing we could guess that happened was that a pin came loose in the bolt and locked up the action, this was 20 yrs ago. I know this isnt much help but this is what we had to do to get it fixed. Good Luck deathray
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