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Old December 14, 2009, 07:59 PM   #1
booker_t
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Marlin .22WMR Rifle Fails to Feed (Pics)

Hey all, any advice on how to solve this little feeding problem would be greatly appreciated.

So I've had this Marlin rifle for a while, it's pretty slick, stainless bull barrel, .22WMR and has great accuracy out to 150yd or even a bit more. Unfortunately, the 14round tube magazine has been failing to feed. I pulled the thing apart and this is what I found.



Basically, the screw that holds the feeding mechanism to the underside of the barrel is made of stronger material than the barrel, and has stripped the threads in the barrel, while only slightly marring the threads on the screw. It may be that the previous owner of the rifle tried to rebuild this thing and over-torqued the screw, which started the thread-stripping process.

The result is the entire assembly isn't secure to the barrel, so the spring has nothing to act against (it's supposed to seat into that circular divot on the barrel) and apply force to the feeding arm, as I'm sure the vast majority of people who read this are fully aware. Here's a few more photos to clarify:

Detail of the feeder assembly:


Overview of the construction:


Barrel detail:


At first I tried thread locker, red locktite, and that didn't help, mainly because there are no threads in the barrel left to lock.

Second, I tried a little dab of JB Weld on the screw and the hole (formerly threaded hole) in the barrel. I was really hoping that would make a quick easy fix, clamped the entire thing with some zip ties and let it set for about 18 hours, well it didn't work. It might be that the JB I used as old, it seemed gummy, so I might try that again.

Other options I've considered are re-tapping the barrel, and getting a new, fatter screw, which is probably the "right" way to do it, but I only paid $150 for the rifle so cheap & dirty fixes are still on the table. Final option would be to just clamp it down and fill that little hole with my TIG welder, use some 100mph tape and a wooden dowel rod in place of the bolt to keep slag from getting in the barrel.

Any other suggestions? If I were to get a larger screw and tap out the barrel, is there a recommended thread size, or will any machine screw do? The existing one seems to be a coarse machine thread.

Thanks!

PS Apologies for the large photos, wasn't able to embed HTML, maybe it's disabled on this forum? Either way.. if you need additional photos to diagnose I can provide.
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Old December 14, 2009, 08:46 PM   #2
2003flht
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Heli-coil?

http://www.emhart.com/products/helicoil.asp
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Old December 14, 2009, 08:54 PM   #3
Stumper
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For "quick and dirty" try 'Quiksteel" epoxy putty. Degrease the barrel hole well. Wax the screw threads.(even better would be to plug it with epoxy and redrill and tap. Either way it will probably work-that stuff hardens a lot tougher than JBweld....If not you can still try a helicoil or retap for a larger screw.
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Old December 14, 2009, 10:49 PM   #4
booker_t
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Thanks.. I'll probably try that Quiksteel first and see what happens!

OH, and I called it the "barrel," I guess that's technically the upper receiver, or just the receiver, which the barrel is connected to. heh

Last edited by booker_t; December 14, 2009 at 11:09 PM.
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Old December 15, 2009, 12:58 PM   #5
Scorch
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Quote:
At first I tried thread locker, red locktite, and that didn't help
Nope, won't hold long enough to permanently bond.
Quote:
just clamp it down and fill that little hole with my TIG welder
That'll work, but it's permanent, so just hope you get it right the first time.
Quote:
Other options I've considered are re-tapping the barrel, and getting a new, fatter screw, which is probably the "right" way to do it,
Yes, that is the right way to do it. Or take it to a smith and he will charge you $30-$40 to use the correct pitch screw when he drills and taps it.

If all else fails, take a prick punch and put 3-4 punches around the edge of the hole so the screw has something to bite on, then a drop of red Loctite will take care of it.

If it was mine, I would just tap it for the next bigger size and be done with it, you're wasting a bunch of time and energy instead of going to a quick and easy fix.
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Old December 15, 2009, 03:34 PM   #6
booker_t
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Thanks Scorch, on further consideration I'm going to get a tap and do it properly.

By the way, I'm diggin that bowling ball mortar!
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