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Old 01-30-2020, 4:39 PM
jerdog3 jerdog3 is offline
Join Date: Dec 2015
Posts: 200
iTrader: 2 / 100%
Default JM stamped Marlin with loose magazine tube...

Hey gang,
I just bought a beautiful JM Stamped 1894 CB Limited .357 /.38 (S# starts with 93. I think that makes it a 2007). I know people like to loosen the mag tube from the barrel for accuracy reasons, but shouldn't it be firmly attached if it's going to do more than sit in my safe and bench rest shooting?

I bought it from a great guy who told me he does this to all his Marlins, and they are all very accurate. I don't want to ruin the accuracy, but it doesn't sit right with me to have a loose mag tube. I feel like I can knock it off or something because it slides around in the dove tail near the muzzle.

So here are a few things I found that I could do, and I'd like to run them buy you boys while I'm waiting for the 10 day waiting period to get it from my ffl. Let me know if any of them sound good, bad, or ugly. Haha. Also, let me know if you think I should leave it be, because that is what I've mostly found on other posts. And I know I'm not going to be going through the thick brush of Los Angeles, or jumping off a stagecoach, but it's an uncomfortable feeling knowing that mag tube is loose and sliding around in the dovetail.

“With a little work you can fix it yourself (best to tighten the fit). Remove the forearm and mag, slide the stud/tenon mag hanger out of its dovetail, and degrease both parts. Put a drop of red (permanent) threadlock on the dovetail surface and reinstall the magazine stud. After checking to see that the stud is centered, stake each side (fore/aft) of the dovetail using a center punch, just at the edges of the joint, where the barrel material overlaps the stud tenon. That should hold it.”

“The end of your mag tube (muzzle end) should fit on the 'male' stud attached to the underside
of the barrel. Then a screw goes thru the magtube and magtube end piece that securely
screws into that stud.
I'm not sure how your mag tube is loose unless the male stud is not properly fitting into
its dovetail on the underside of the barrel.
If this stud is loose and freely moves side to side, you can 'peen' it in for a tighter tolerance.”

“Peen the bottom of the part that fits into the dovetail. Always modify the least expensive part if possible. You could try a piece of aluminum foil under it first.”

Before you shoot this rifle. Check each and every screw to be sure they are tight.
A drop of red #271 Loctite on the dovetail and sitting it in a warm area overnight will fix the issue.

Another “fix” is to use a center punch to put several dimples in the bottom of the male part that slides into the dovetail. That will increase the friction and still let you take it out if you want. Works with loose sights too.
This is a good fix where you can still remove it when necessary. Red Loctite is not permanent as heat weakens it. If you shoot black powder, that barrel will get hot.

Thanks for any, and all, advice!

Last edited by jerdog3; 01-30-2020 at 4:53 PM..
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