Dad bought a new Remington 11-48, manufactured in February 1952.  Shot it for decades, mainly dove hunting and skeet.  He like the gun, but in the early 1990s, it would consistently jam after the second shot.  He broke it down and did a thorough cleaning, but it still jammed.  Took it to a gunsmith, he claimed to fix the problem by cleaning it for a ridiculous charge, but it still jammed.  Dad stuck the 11-48 in the safe and got a new gun.  30 years later, I took it to the range.  Jammed on the second shot.  I completely cleaned it, but it still jammed.  Checked the action spring located in the stock and found it to be about 2" shorter than a new one.  Replaced the action spring and it fires like a new shotgun.  Would like to take Dad dove hunting with that old gun, but it's too late now.

I’m sure you’ve already returned the gun to your customer, but I have an 11-48 and had the same issue. I was able to track down an original owners manual for it and it calls for motor oil (30wt if I recall correctly) on the recoil spring, bushing, and magazine tube. Mine runs flawlessly with the motor oil. Probably worth sharing with your customer before trying to track down a new bushing.

The recoil spring on the barrel needs to be thoroughly oiled, also long neck brass will help it feed perfectly

Mine was having cycling issues also and we ran about 4 high brass buckshot loads through it and now it cycles fine

These guns are recoil operated, the recoil spring is on the magazine tube with a brass bushing that is used to make the gun cycle with high or low pressure loads. Turn the bushing over and try again.

These run great with the friction bushing but, do require cleaning and lubrication. Rather than removing or modifying the friction bushing I would recommend a complete teardown and cleaning. During the process remove the stock then the recoil spring. Give the recoil spring and tube a good cleaning and LIGHT lubrication then reassemble. Never had one not run after this process. Make sure you get the stock fit back correctly and that it is tight. If you don't, the recoil operation of this shotgun will crack the stock at the receiver.  
The nut that holds the stock on requires the use of a large flat blade screw driver and if installed properly will be tight. I made a tool with a driver inserted in a pipe that allows me to use a wrench or socket and maintain a bite on the nut.
The bushing is there for a reason. This shotgun is not like the A5 or Model 11 and does not have the rings that are turned for lighter or heavier loads.

Understand that the basis behind this is that any 11-48 is going to be an old gun. Likely, it has sit quite a while as most were grandpa's gun and there's a good chance he used a lubricant that over time gets a little sticky. A good cleaning and lube goes a long way toward proper operation.

The original owners manuals call for using light weight motor oils. We have many options for better lubricants today. Standard motor oils are actually pretty dirty. I've had really good luck using very light coats of synthetic 5w-30 on moving parts. A LITTLE BIT GOES A LONG WAY!

The model 11 has a brass friction ring in that the beveled end facing the barrel lug for heavier loads and then turned around for lighter loads, the 11-48 friction ring is similar but modified to be self adjusting but make sure it's orientated correctly when reassembling. When cleaning the gun I would use solvent and 0000 steel wool and make sure the ring is cleaned off of any carbon and also wipe down the inside of the barrel lug that it fits into. Also the recoil spring might be weak. These older guns can be a bit finicky with whatever loads you were feeding them though. Now I want one!

I love my 11-48 it was passed  on from my great grandfather  to my grandfather  and to my father ,then me and I never have an issue  with it  ,,only the shell lotch  goth broken and I replace it

Got mine from my father for my 40th birthday, runs smooth as all hell, never had an issue other than a sore shoulder. It's from 58 and I believe they actually stopped making them in 62 not 68.

I recently acquired the same gun from a grandfather who passed. It’s having the same issues. Can you do another video that is more detailed? Maybe a break down and explanation on the friction ring?

wish you had shown the bushing in the gun i have the same gun having the same problem

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I love mine..its window an unknown gem .those who know know.thise who dont think there junk.  There awsome

En calibre 12muy buenas

Is that friction bushing necessary? I mean if it runs flawlessly, why put it back in?

Do you know what type of choke it was. I'm trying to find one myself. I have the same model

I “kilicked “ on this vid @ 11:48 - no joke!

What does the friction booshing do?

You can reconfigure the friction rings for heavy or light loads. For heavier loads put both rings on the end of the spring towards the muzzle end. For lighter loads put the smaller ring at the end of the spring towards the trigger (beveled side towards the trigger) and the put the spring back on and put the larger ring on after.

I had one beautiful gun it had a Monte Carlo stock but it came with three barrels a 30-in full choke a 26-in skeet choke and a 21-in modified choke very versatile Love that thing. And the barrels would fit on a 870 wingmaster they were interchangeable from what I remember