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Posted: 3/29/2026 1:35:17 PM EDT
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I bought a Plainfield M1 carbine from an estate sale. Got a great deal on it. At first it was fine, then it would not feed so I changed mags and the mag catch and release along with the spring. Took it out to the range then it was not extracting. I am pretty sure the bolt would come back but it would just go forward into place. So today I did a complete field strip to take a look at everything . Excuse me if some of terminology is off. But when I remove the piece with the charging handle in it. I found this round piece of metal with a spring on in the front cup portion of it. I determined it came from under the barrel and it went in there. I slipped it back in there and it fits with out force but I am Guessing it isn’t suppose to come out. Basically looking at I am guessing I’m pretty screwed. Picture included. 
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Six
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That is the gas piston/piston nut and housing. The piston housing (not sure if I'm using the correct terminology) appears to be damaged which is why the piston isn't staying in place. I'm not sure if that's a part that can be replaced easily or at all. See pic for what a gas piston/nut/housing should look like. Attached File |
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Should I jump on this? https://www.ebay.com/itm/276066149804 |
Six
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Originally Posted By Sixgun357: Could he have ran some super hot hand load? Because the trigger group was replaced. I've no clue. Maybe corrosion from corrosive primers? I know this is when I wish I had a machine shop! Mill away the damaged part, make a new section, and TIG weld it in place. |
'' THE STRONGEST REASON FOR PEOPLE TO RETAIN THE RIGHT TO KEEP AND BEAR ARMS IS,AS A LAST RESORT,TO PROTECT THEMSELVES AGAINST TYRANNY IN GOVERNMENT.'' THOMAS JEFFERSON
"You skunk-haired motherfucker." TEETER
"You skunk-haired motherfucker." TEETER
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No, get a new barrel or GI barrel. These are super easy to rebarrel with the index marks. If I knew where my stuff was boxed up at in the ship I'd let you borrow my barrel wrench and headspace gauges. I'm sure you could fund a loaner set somewhere. Attached File |
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First question is..... do you have the old original; Plainfield Carbine, or the later modified version. The original was a close copy of the USGI Carbine, the later version has two recoil springs, a badly redesigned gas cylinder, and a stamped and welded op rod. If it's the later version, the best option is to part it out, because these were very problematic rifles that break and give lots of problems. From the looks of the posted barrel, someone tried to weld the gas piston...badly. |
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Originally Posted By dfariswheel: First question is..... do you have the old original; Plainfield Carbine, or the later modified version. The original was a close copy of the USGI Carbine, the later version has two recoil springs, a badly redesigned gas cylinder, and a stamped and welded op rod. If it's the later version, the best option is to part it out, because these were very problematic rifles that break and give lots of problems. From the looks of the posted barrel, someone tried to weld the gas piston...badly. Plainfields did not have two recoil springs. You're thinking of Universal. |
| So I got to to take my M1 carbine out to the range today after getting the new barrel Plainfield I bought off eBay installed. It ran perfectly with my 2 15 round mags and my 30 rounder. I used 50 rounds of S&B ammo and 50 rounds of PPU (Prvi Partizan) FMJ ammo and it ran flawless. Now I just need to try out some Hornady critical defense ammo thru it and then I may make it my main home defense rifle. |
Six
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