Welcome to the forum! Place a towel on a flat surface, make sure it won't slip, hold gun in right hand muzzle down, push downward, entire top assembly (cannon) will move about 1/4"
to the rear, when as far down as it will go rotate locking nut/takedown lever downward,(there is a small spring that looks like a bent piece of wire in front of the lever, shouldn't come out but it can if worn when lever is removed), if lever is very hard to turn then apply some type of lubricant and let sit a day or so. Glad you are here, folks here are glad to help. Tell us more about your gun. In the Technical & General Information section of the Forum are lots of diagrams and resources.
rk
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