Remington 1100 not cycling

[James dailey]

hey all,
I recently purchased a new barrel for my 1100 to replace the original to be able to have the convenience of choke tubes. The original barrel is a fixed modified barrel with two gas ports not a magnum 2&3/4” shells only. The cycling of the gun works flawlessly with the barrel.
The new barrel however will not cycle at all. It also is not a magnum 2&3/4” shells only but it only has one gas port.
I guess I have two questions since clearly the issue is the lack of the second gas port in the new barrel.
1: Can a second gas port be drilled?
2: What would be the purpose of this barrel is you need two holes to cycle with a non-magnum round?
Any feedback would be great.
See attached pics.

 

[Virginian]

The barrel should have two (2) gas ports. The Magnum guns had barrels with one gas port and a heavier action sleeve; it was a balanced system. I would say someone screwed up. I would call Remington. You can certainly drill a second port, but it is also easy to screw up that operation. Since they haven't made magnum 1100 barrels since 1990 maybe yours started out going to be a Steel Shot barrel. The new Sporting barrels actually have slightly larger ports than the old field grade guns because so many people these days shoot mouse fart loads.

 

[Milkmaster]

This might help you to know exactly what barrel you have...

 

[Virginian]

There are no single port 2-3/4" barrels on that chart above .410.

 

[mcb]

What condition is your oring in?

 

[entropy]

Listen to Virginian; he knows what he's talking about, and again, beat me to it.

Personally, I'd trade it for a two-port barrel.

 

[cdb1]

Virginian does know his stuff.

 

[Riomouse911]

If, and that's an if, the gas port is proper as-is, were the rings installed correctly when you put the new barrel on? I bought a LT20 that "didn't work" for cheap. All I did was reverse the metal washer and replace the rubber o-ring and it works just fine. (It almost looked like the metal ring was properly installed when in fact it was on backwards.)

Start there, then if it works you've solved it. If it still doesn't, the barrel may be mis-drilled and should be sent back.

Good luck!

 

[Kp321]

I have converted several magnum barrels to use field loads by drilling the single gas port larger. I don't have the numbers in front of me but the process is simple. Carefully measure the diameter of the gas ports on the old barrel and calculate the total area of the ports. Figure what diameter would give you this area in a single hole and use the nearest drill bit to enlarge the single port. Calculate area, just doubling the drill bit size gives you four times the area!

 

[Virginian]

A single port with twice the area will flow more than twice the amount of gas with the same pressure differential. I am not going to go into storage and dig out my old fluid dynamics textbook, but I know that's a fact. You are much safer drilling a second port, or just drill out the port one drill size at a time until the gun functions, but you may damage it shooting heavy loads in the future.

 

[spazzy]

I was gifted an 1100 magnum but dont really shoot many 3 inch or even heavy 2 3/4 loads. My gunsmith runs into this situation quite a bit and has a procedure to deal with it. He drills out a 2nd port and then taps it and includes a set screw to fill the hole if I ever want to shoot 3 inch loads.

 

[entropy]

That was a common "fix" back in the 60's and 70's, apparently some still do it.

 

[Virginian]

On many European 1100s they fitted a tapered cross screw thru the ports so you could adjust the gas flow. But apparently liability laws in the U.S. scared them out of doing it over here. Understandable.

 

[Jack Ryan]

A single port with twice the area will flow more than twice the amount of gas with the same pressure differential. I am not going to go into storage and dig out my old fluid dynamics textbook, but I know that's a fact. You are much safer drilling a second port, or just drill out the port one drill size at a time until the gun functions, but you may damage it shooting heavy loads in the future.

"Double the diameter = 4 times the flow."

3.14 x the radius squared gives you the area of a circle

 

[mcb]

"Double the diameter = 4 times the flow."

3.14 x the radius squared gives you the area of a circle

If only fluid flow was that simple. You have to take into account the boundary layer stuck to the surface and the entrance and exit conditions and the very likely case this is a choked flow condition as most gas ports are.

 

[Jack Ryan]

LOL, and after they calculate all that in down to +- .0001, then use the nearest drill in your index. ROTFL