I have a 12 gage mossberg shotgun and I need to clean it. I do all of my cleaning myself. I own several guns. I have forgotton how to disassemble this one though. Can I get some help? Pictures would help the most.

Numrich for parts always.

Winchester Shotguns 37A - Numrich Gun Parts

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Find Winchester Model 37A parts and schematics today with Numrich Gun Parts. Providing parts since 1950.

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  Winchester Shotguns 37 - Numrich Gun Parts

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  Find Winchester Model 37 parts and schematics today with Numrich Gun Parts. Providing parts since 1950.

1993 WINCHESTER Model 37A Shotgun Schematic ... - eBay

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1993 WINCHESTER Model 50 and 59 Automatic Shotgun Exploded View Parts List ... 1992 MOSSBERG Model 500 & 590 Mariner 12 gauge Shotgun AD w/ original prices.
US$10.95 · ‎In stock

bring it to a gun shop.

Pretty much all bolt action bolts work the same. You need to relieve the spring force. That means pulling back on the cocking knob. The head will come off easily then. You need to have the bolt in the exact condition it's in when cocked, cocking knob back, to disassemble it. Reverse that to reassemble.

Apparently the three previous folks have no idea that a Mossbergt 100 ATR is a RIFLE not a shotgun. Regretfully it is a press fit at the rear (multiple splines, pressure fitted into multiple recesses). What that means in English is that it's a factory fix. Sorry!

Try going to the website www.mossberg.com for a instruction manual for your shotgun.

For any top mounted rail on any gun, you'll need the gun to have or be drilled for the proper screws. Your Mossy, if it's already drilled, will have four tiny little screws plugging four tiny little holes on the topo fthe receiver. Remove those, put the rail in place, and replace the screws with the ones included in the rail kit. If your gun IS NOT drilled, you can have it drilled....which will cost more than the rail kit....or you can skip that rail and go for a clamshell or side mount rail instead. Both of those use the ejector screw and the trigger retainer pin to attach them.

A Mossberg 500 is a pump shotgun, not a break barrel over/under. I'd guess it's user error, myself.

A shotgun will shoot anything shorter than the max length specified. The only problem you may have is lightly loaded smaller shells may not cycle your gun. Most 3" magnum semi autos will cycle 2 3/4 inch shells just fine.

oh no! not another mossberg shotgun!!!
they dont need to be cleand,,, just pull a brush up the barrel and give it a wip over with gun oil,, i some times give the triger a spray with wd40,,once in about 5 years only? there bam good guns,,,a real good work horse but if you realy wont to strip it down look on the internet there on there all striped down for you to see how to brake it