Got this old mossberg plinkster 377 earlier this year and never got around to getting it fixed up. Last weekend I went out to the range and brought it with me to see what was the actual problem upon firing. Basically the casing just gets jammed and won’t eject at all.

I’m going to strip it down and clean it as good as possible. My question is what is best to soak this in for a few hours to really get the gunk moving?

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Posted by Big Shote

Alabama

Member since Nov 2020

23 posts

Posted on 11/12/20 at 2:38 pm to thegreatboudini

CLP

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Posted by Got Blaze

Youngsville

Member since Dec 2013

9501 posts

Posted on 11/12/20 at 3:48 pm to thegreatboudini

The bore may be pitted and full of rust & gunk. If you feel comfortable doing this, remove the barreled action from the stock. Soak the BA and bolt in Varsol for 12-24 hours, use a toothbrush or small pic to remove the grease gunk build up in the action. Clean the bolt assembly (spring and firing pin) real good since it also collects lint, dirt, debris, and powder residue. Use a boresnake and run it thru the barrel many times to clean the bore. I would polish the chamber using a modified cleaning rod with a brass brush, and steel wool attached to a drill. Once clean, use an air compressor and/or q-tips, shop towels to dry off the metal parts. Spray BA and bolt with Eezox, Break Free, or similar gun oil lubricant to prevent rust.

FWIW, here's an example using a revolver cylinder. Polished vs. dirty chambers.