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.

sorry, 30, old fingers sometimes miss keys. 

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.

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.

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! 

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

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.

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!.  

   I replaced the extractor, extractor spring, and extractor spring plunger, with parts ordered from interarms Texas, and then tried again, with exactly the same result every time. 

  the extractor seems to have too much pressure from the spring, so that it will not be pushed back out toward the perimeter of the bolt face by the chambered cartridge's rim enough to slide over the rim and engage its claw into the slot of the cartridge rim.

any suggestions?

thanks.

Just guessing, but the main spring could be weak and can’t find the energy to strip a fresh round and force the bolt home? If it seems to cycle properly by hand, could be a weak spring or some sort of rub or interference in the action. 

Manually cycle it and report.

the first round gets chambered normally by racking the slide normally, so i don't think it's caused by a weak recoil spring. 

Is the extractor nose protruding past the bolt skirt? Are there any marks on the breech-face that could be made by the skirt or extractor striking it?

Is head space too tight?

I have a pic of that system. I will see if I can find it.

Here it is. One on left is GI. The right came from an IJ.