pulling out what little hair I have left.

OK I'll take SPRINGS for $0.02 since I don't think that M2 receiver steel could have been worn down like that by a much softer material like copper even after thousands of rounds. But since I don't have my drawings with me, I can't really be sure. But since hand cycling "works" and "live" cycling doesnt ...

When was the last time you checked your magazine spring(s)?

There's a right way and a wrong way to install them. Needless to say, the wrong orientation will function very poorly.

How is your magazine spring oriented inside the magazine? You can't just stuff it in and close the end.

SIDE VIEW OF SPRING (breech is on the left and muzzle on the right)

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The "arrowheads" point in direction of bullet travel when correctly installed

If this is not revealing, get a known-to-be-good USGI mag (lots have been wrecked by end-user "tweaking" so BORROW one your eyes and ears tell you is functional at your range). See if that helps.

I'm posting a few images of my feed ramps and then one of a magazine comparison. It's fairly clear to me that the feed ramp on my Inland has been polished at one time. The darker feed ramp is from my Quality Hardware Carbine, both feed flawlessly.

The only cycling issues I have had in the past were due to improper cold weather preparation methods and or underperforming ammunition.

After resolving these issues the only other cycling issues I have had have been due to the unfortunate aspect of purchasing improperly manufacture or stored magazines.

W5USMC wrote: oldfart69 wrote: is the feed ramp part of the receiver or barrel? Just trying to learn here. The feed ramp is part of the receiver. One thing, I know that you have mentioned trying a number of different magazines but I do not recall if any have been USGI mags, as mentioned by other members USGI magazines are the way to go. I personally think that your receiver's over ground feed ramp is the problem but USGI mags are not very expensive and may be worth a try.

The magazine I show on the right had to have the right ear opened up just a tiny bit. I show it already repaired, but before it was repaired it failed in both my rifles. BTW I never slam a magazine home when placing it in the rifle.

Bubba-7 wrote: After all you have done, I would check the gas nut to see if it is the late style.  While it is out, I would size the gas port and be sure it is at least 0.070" dia.  Then clean it.

Definitely try some USGI magazines. 90% of the time, problems like you mention are the result of magazine issues. If Kahr/AO Carbine magazines are anything like most Kahr/AO Thompson drums, I would eliminate them as a factor while troubleshooting your Carbine issues.

David Albert
dalbert@sturmgewehr.com

oldfart69 wrote: I also put my friends entire lower trigger group in my rifle and shot with it as well with marrginally (maybe my imagination) better.

This is the way to troubleshoot your issue(s).

Start with your barrelled receiver. Then assemble *all* of your friends parts onto it. You know his/her's works right? Does your's now work?

If the problem is not "fixed", it lies with your barrelled receiver to wit check your barrel alignment to the receiver.

If function is significantly better then you can start putting your parts back into the mix, one part at a time until badness reappears.

I think all of us have pretty much demonstrated the Plainfield ramps were finished in this manner. I also think we can agree that OP’s has been polished...severely. Probably done because it may have had feeding issues from the get-go. Plainfield barrels are not skirted... maybe that aggravates things, but I have two un-skirted barrels in guns that function just fine. I have read where it could have been an issue. If the bolt does not properly seat it could cause extraction issues. *all* means change the bolt also.

painter777 wrote: I agree with all the input. Ramp is one of the roughest most distorted I've ever seen. But.... with him being able to hand cycle with NO issues. I'd follow up on the advice from Roger M and make sure the Gas Cylinder is clear. If restricted it could be killing the energy the carbine relies on 'After the shot'. Easy enough to check. Good Luck, Charlie-P777 ADD: Also look for Burrs on the inside rails the bolt lugs track on.