Remington 1100, 410 barrel depression and bulge

[n4rod]

I bought a used Remington 1100, 410 yesterday. It's a really nice gun with the enhanced game scene roll engraving on the receiver. Nice wood, too. When cleaning it I discovered something strange with the barrel. About halfway between where the magazine lug ring is welded on and the muzzle there is both a 360 "dimple" all the way around the barrel, then just below that there is a tiny bulge about an inch long. There is no corresponding dimple or bulge in the rib, or inside the bore. And in the dimple there are multiple "dings" through the bluing. I got my first Remington shotgun in 1959 when I was 10. I've had many of them in the past 61 years and I have never seen anything like this in another barrel. Just wonder what it's from. I doubt it was being fired with a barrel obstruction as I would think these defects would be more catastrophic. Any ideas?

Rod

 

[GeauxLSU]

Bizarre. No clue. In for guesses.

 

[Gaffer1968]

Some discussion here....

Joining two pieces of barrel together ... (practicalmachinist.com)

 

[Braxton1]

That is strange. I wonder if there was ever a dent in the outside of the barrel and someone used a tool like a hydraulic dent raiser (like Brownells part 080-083-020) to roll the dent out.... I haven't seen one of those tools for a 28 ga. or .410, but it seems possible.

 

[blazedawg87]

In for answers.

 

[imawoodsman]

BLIP ?
He runs into crazy stuff ALL the time!

 

[MuleShoe]

IVE SAW WHERE SOMEONE SHOT THEM WITH OBSTUCTION IN BARREL BULGED AND WHERE SLUGS WERE SHOT THRU A FULL CHOKE GUN BUT THATS AT ABOUT 2 TO 3 INCHES FROM END OF BARREL WHERE THAT OCCURS !

 

[n4rod]

I really have no idea how these "defects?" got there. And I have no idea how Remington makes their barrels. But I did pull a theory out of thin air. Maybe..... when the raw barrel was being made, something went wrong. Don't know if they are extruded, or milled from round stock like a rifle barrel. But some how the dimple and bulge were formed when the barrel was made and still raw, in the white. Then the rib was soldered on. The barrel was polished and blued. Then the bore was machined or honed to specs. Finally the muzzle was threaded for Remchokes. The reasoning for my theory is that the dimple and bulge go 360 degrees completely around the barrel, but there is nothing in the rib or bore. I can see the dimple and bulge under the opening in the rib, but nothing on the rib. I haven't got out the calipers to see the actual dimensions, but guess they are maybe .005-.008 in size. Not very big. So don't think it happened by impact. And there is nothing in bore. So don't think it happened by firing with an obstruction in the barrel.

I bought the gun from a highly trained and multi-brand armorer and professional gunsmith that has been my trusted good friend for almost 40 years. He told me he noticed it when he bought the used shotgun maybe 10 years ago. He inspected the bore and patterned it at 25 yards. He said it patterned very well with no big holes or lopsided pattern, so he just kept it and has been shooting it with no problems.

I don't remember what years Remington used the infamous "J" lock ISS system, but this 1100 has it. But I do remember that those were put on in the "later" years of production when paranoid lawyers directed the firearms manufacturing industry. I also remember those were the years when firearms quality drastically suffered and pride in firearm makers work fell into a deep slump. So it doesn't surprise me that this barrel, with the defects, could have made it all the way through the manufacturing process, installed on a firearm, and shipped to a distributor without any employee inspecting it for quality.

It's an otherwise beautiful little shotgun and I plan on using it for many years. Probably wouldn't ever come across a replacement barrel anyway.

Rod

 

[GeauxLSU]

I really have no idea how these "defects?" got there. And I have no idea how Remington makes their barrels. But I did pull a theory out of thin air. Maybe..... when the raw barrel was being made, something went wrong. Don't know if they are extruded, or milled from round stock like a rifle barrel. But some how the dimple and bulge were formed when the barrel was made and still raw, in the white. Then the rib was soldered on. The barrel was polished and blued. Then the bore was machined or honed to specs. Finally the muzzle was threaded for Remchokes. The reasoning for my theory is that the dimple and bulge go 360 degrees completely around the barrel, but there is nothing in the rib or bore. I can see the dimple and bulge under the opening in the rib, but nothing on the rib. I haven't got out the calipers to see the actual dimensions, but guess they are maybe .005-.008 in size. Not very big. So don't think it happened by impact. And there is nothing in bore. So don't think it happened by firing with an obstruction in the barrel.

If your theory is correct, (and I'm not saying I have a better one), they win the award for worst quality control, ever.

 

[BLIP]

A socket