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new to me plainfield

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oldfart69 View Drop Down
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    Posted: Apr 12 2019 at 10:18pm
Hi guys, I have a new to me plainfield m1 carbine. I am onlyt having one issue right now and hopefully it it is a mag issue not a headspace issue. If I load 1 round it ejects perfectly, anything more and on occasion it is having failure to extract from the chamber. I do not have any facilities to measure headspace. Anyone out there have any tips to share with this newby? thanks in advance
THE oldfart69
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Post Options Post Options   Thanks (1) Thanks(1)   Quote W5USMC Quote  Post ReplyReply Direct Link To This Post Posted: Apr 12 2019 at 11:04pm
A few possible causes.
Check the extractor claw for damage or excessive wear.
The extractor spring could be broken, weak or missing.
Dirty or pitted chamber.
Short recoil, does the gas piston move freely.
Gas port clogged.
Operating slide arm twisted or bent.
What ammo are you shooting, is it possibly under powered.
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Post Options Post Options   Thanks (1) Thanks(1)   Quote bonnie Quote  Post ReplyReply Direct Link To This Post Posted: Apr 13 2019 at 8:52am
Adding to what W5USMC posted.

As old as a Plainfield is and not knowing the history of it why not go ahead and replace these old parts with new?
A new recoil spring, extractor with spring and ejector with spring are not very expensive. I would use only USGI parts and stay away from so called "high speed" replacement springs.
You would also need a bolt tool to disassemble/assemble the bolt, which is good to have anyway.

A good recoil spring should be aound 10.25" in length. 10" or less and the spring is wore out

A 9mm bore brush make a good chamber brush for the carbine.

A few decent USGI 15 round magazines and some good commercial FMJ ammunition.

Does not sound like a headspace issue to me at this time.

I have had several Plainfields in years past and these are decent commercial carbines.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote oldfart69 Quote  Post ReplyReply Direct Link To This Post Posted: Apr 13 2019 at 2:56pm
Originally posted by W5USMC W5USMC wrote:

A few possible causes.
Check the extractor claw for damage or excessive wear.
The extractor spring could be broken, weak or missing.
Dirty or pitted chamber.
Short recoil, does the gas piston move freely.
Gas port clogged.
Operating slide arm twisted or bent.
What ammo are you shooting, is it possibly under powered.
 first thanks for your service.
I am using either remington 110g sp ammo, or aquila 110 fmj right now. that is all that seems to be at my lgs's . I have dies, powder, and 110g fmj bullets and am planning to use  allaint 2400 powder as soon as it all gets here.  The recoil spring is 10 ¾" long. The guide rod was caked with crud and now is clean and flitzed, Gas port looks good operating  looks in good alignment with the gas block and the assembly moves freely. I cleaned the chamber with Hoppe's #9 then swabbed it our and used my moto tool with a 90 degree attachment to flitz out the chamber (but have not yet returned to the range) . As I said in my first post, I have ordered 2 new factory mags, they are not here yet. I think the old 40 round mag that came with it may be the issue as it cycles fine with a single load.  Thant is about it for now, will return to the range next week then all the bits and pieces are here and installed. Thanks for all your help.
THE oldfart69
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Post Options Post Options   Thanks (1) Thanks(1)   Quote jackp1028 Quote  Post ReplyReply Direct Link To This Post Posted: Apr 13 2019 at 3:17pm
Hi and welcome to the forum from New Mexico!

40 round magazine? That might be the problem.
JackP
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Post Options Post Options   Thanks (0) Thanks(0)   Quote oldfart69 Quote  Post ReplyReply Direct Link To This Post Posted: Apr 14 2019 at 1:30am
Originally posted by jackp1028 jackp1028 wrote:

Hi and welcome to the forum from New Mexico!

40 round magazine? That might be the problem.

sorry, 30, old fingers sometimes miss keys. 
THE oldfart69
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Post Options Post Options   Thanks (0) Thanks(0)   Quote oldfart69 Quote  Post ReplyReply Direct Link To This Post Posted: Apr 25 2019 at 2:33pm
Originally posted by oldfart69 oldfart69 wrote:

Hi guys, I have a new to me plainfield m1 carbine. I am onlyt having one issue right now and hopefully it it is a mag issue not a headspace issue. If I load 1 round it ejects perfectly, anything more and on occasion it is having failure to extract from the chamber. I do not have any facilities to measure headspace. Anyone out there have any tips to share with this newby? thanks in advance

follow-up on the 25th: two range trips in now, each much better. Still 4 failures to extract out of 40 rounds (4 reloads of 10 round new mags) . Cleaning seemed to help this the most. So, I ordered new extractor, spring, and button, new ejector and spring, new bolt spring and new firing pin from Numrich. today. Report after they are installed and tested. It is a process, but I am a patient old cuss and I will ficx this thing to the best it can be.

THE oldfart69
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Post Options Post Options   Thanks (1) Thanks(1)   Quote floydthecat Quote  Post ReplyReply Direct Link To This Post Posted: Apr 25 2019 at 3:43pm
Based on my personal experience, the #1 issue with extraction failures involves a dirty or marred claw, or the extractor plunger spring. A spring that is less than 400/1000th. in free length is suspect. Rake a sharp tool like an awl or dental-pick under the claw fingernail. Carbon will build-up there and it will not hook the rim. 

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Post Options Post Options   Thanks (0) Thanks(0)   Quote oldfart69 Quote  Post ReplyReply Direct Link To This Post Posted: Apr 29 2019 at 10:08pm
well all, I have screwed the pooch, I tried to change out the extractor spring and knob, did not have any trouble disassembling, but can't reassemble, on ebay to try to get a bolt disassembly reassembly tool. news at 11. 
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Post Options Post Options   Thanks (1) Thanks(1)   Quote floydthecat Quote  Post ReplyReply Direct Link To This Post Posted: Apr 30 2019 at 6:58am
If one has, or ever plans to own a carbine and do their own maintenance, the single best thing you will ever own is a bolt-tool. It can be done my hand, but you need three. One unneeded trip to a gunsmith will surely pay for the tool.

Springs and plungers pop in and out of M1 and M14 actions and the carbine started life with a like system. It was discovered they would “self eject” from the carbine action and the system had to be modified by the addition of the ledge on the extractor.
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Post Options Post Options   Thanks (1) Thanks(1)   Quote BER911 Quote  Post ReplyReply Direct Link To This Post Posted: Apr 30 2019 at 7:45am
"If one has, or ever plans to own a carbine and do their own maintenance, the single best thing you will ever own is a bolt-tool. It can be done my hand, but you need three. One unneeded trip to a gunsmith will surely pay for the tool."

Amen to that statement!  I bought the USGI Bolt Tool and have dissembled, inspected, cleaned and reassembled the bolts on both of my carbines.  Someone also gave me the tip of reassembling the bolt inside a gallon size zip lock bag, just in case one of the small springs slips out of the tool.  That tip saved my butt once because I did have the extractor fly off it's spring; the zip lock bag caught it before it went into earth orbit! Shocked


Semper Fi, Bruce
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Post Options Post Options   Thanks (0) Thanks(0)   Quote oldfart69 Quote  Post ReplyReply Direct Link To This Post Posted: Apr 30 2019 at 2:27pm
Originally posted by oldfart69 oldfart69 wrote:

well all, I have screwed the pooch, I tried to change out the extractor spring and knob, did not have any trouble disassembling, but can't reassemble, on ebay to try to get a bolt disassembly reassembly tool. news at 11. 

follow-up on STP, Well I tried to order the tool on ebay, that was no fun, I think, for me, auctions are a non starter. Got "out bid" 4 times, I think something is fishy. So, I ordered one from numrich with the little knob thing I dropped on the floor and it disappeared. (even though I had a white towel both on the workbench and floor under the vice). The tool and knob were less money and a guarenteed purchase. hope it will be here soon. I did see a pretty good youtube on doing the job. but, I only need the part on reassembly. wish me luck, I will repost on that afterwards along with the range test. thanks guys. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote oldfart69 Quote  Post ReplyReply Direct Link To This Post Posted: May 05 2019 at 12:05pm
Originally posted by oldfart69 oldfart69 wrote:

Originally posted by oldfart69 oldfart69 wrote:

well all, I have screwed the pooch, I tried to change out the extractor spring and knob, did not have any trouble disassembling, but can't reassemble, on ebay to try to get a bolt disassembly reassembly tool. news at 11. 

follow-up on STP, Well I tried to order the tool on ebay, that was no fun, I think, for me, auctions are a non starter. Got "out bid" 4 times, I think something is fishy. So, I ordered one from numrich with the little knob thing I dropped on the floor and it disappeared. (even though I had a white towel both on the workbench and floor under the vice). The tool and knob were less money and a guarenteed purchase. hope it will be here soon. I did see a pretty good youtube on doing the job. but, I only need the part on reassembly. wish me luck, I will repost on that afterwards along with the range test. thanks guys. 


MORE: further, I got the part and the special tool. It took 15 minutes and no stress to get it put back together.I do, however have a question: The feed ramp looks funny to me, it seems to have two distinct "ramps" with a "hump" down the middle. Is this normal I am adding a picture here for clarification. Thanks
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Post Options Post Options   Thanks (1) Thanks(1)   Quote floydthecat Quote  Post ReplyReply Direct Link To This Post Posted: May 05 2019 at 12:25pm
Me thinks Bubba has been turned lose with his die-grinder. Has the area above the chamber on the top right hand side of the receiver ring been altered as well? Looks like it has.

Alterations on the receiver ring in that area indicate that brass (or loaded rounds) was not ejecting properly...hitting the top of the receiver. It looks like they were trying to make it load-n-shoot something that it was never intended to do, like a longer bullet profile? I have a 9-mil carbine that has been relieved in a small area on the inside of the ring to allow a loaded round to be ejected by hand, but it was designed and done at the factory...not in a garage or tool-shed. 

Let me come back and add that I am not bashing the gun, or the previous owners decision to modify it. There may have been a good reason for it. I don’t think anything has been done to the gun rendering it unsafe. If it performs, these are only cosmetic details.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote oldfart69 Quote  Post ReplyReply Direct Link To This Post Posted: May 05 2019 at 8:49pm
Originally posted by floydthecat floydthecat wrote:

Me thinks Bubba has been turned lose with his die-grinder. Has the area above the chamber on the top right hand side of the receiver ring been altered as well? Looks like it has.

Alterations on the receiver ring in that area indicate that brass (or loaded rounds) was not ejecting properly...hitting the top of the receiver. It looks like they were trying to make it load-n-shoot something that it was never intended to do, like a longer bullet profile? I have a 9-mil carbine that has been relieved in a small area on the inside of the ring to allow a loaded round to be ejected by hand, but it was designed and done at the factory...not in a garage or tool-shed. 

Let me come back and add that I am not bashing the gun, or the previous owners decision to modify it. There may have been a good reason for it. I don’t think anything has been done to the gun rendering it unsafe. If it performs, these are only cosmetic details.

Whoever the previous owner was did not replace the extractor or ejector or springs which I just did. I have not gotten to shoot it after I did that yesterday.For sure, it was not extracting or ejecting after the frist round hardly at all. Hopefully it is now. News at 11, The problem with the hump, we will see about as my range isnt open until tuesday. I will report after.  I wonder how, if the hump is an issue, we can deal with it, but that is another story. take care y'all.

THE oldfart69
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Post Options Post Options   Thanks (1) Thanks(1)   Quote floydthecat Quote  Post ReplyReply Direct Link To This Post Posted: May 05 2019 at 8:56pm
Rounds alternately feed from either side of the mag. The hump may not be a problem. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote oldfart69 Quote  Post ReplyReply Direct Link To This Post Posted: May 07 2019 at 5:28pm
Originally posted by floydthecat floydthecat wrote:

Rounds alternately feed from either side of the mag. The hump may not be a problem. 

couldn't wait for my usual day (wednesdays are old guy days) so I went today. I shot 50 rounds, and now only two misfeeds, (zero failure to extract). I am thinking now, that the two "new" 10 round magazines (soon to be mandated in WA). are the issue as the 30 round mag worked perfectly. One of the 10 rounders misfed twice (both on the 3rd round) and the other 10 rounder misfired once on the fourth round. Other than that it was pretty much better today. I am now on a hunt for a youtube video on tuning an M1 magazine. wish me luck!.  
THE oldfart69
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