26" Remington 1100 equates to an O/U of how many inches?

Barrels are measured the same whether an O/U, SxS, Single Shot, Slide Action (Pump) or a semi-automatic.

So exactly what are you asking?



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To answer your question, 26 inch barreled 1100 = 26 inch O/U barrel.



(Can't be sure about the metric system, all I know is the US way to measure things, same number could be different overseas.)

sbwaters

A pump action or semi-auto receiver might add an additional 4" to the overall length of the shotgun. So an O/U with 26" barrels is going to be about 4" shorter overall than your Remington Model 1100. I'm guessing this is the answer to your question.

Can't be sure about the metric system, all I know is the US way to measure things, same number could be different overseas.

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Sure, overseas we have different imperial units for different occasions - being a formal inch, or a casual one, just to name a few. An Oxford inch, a Derby inch, a Brogue Oxford one... It's complicated in the Old Continent.
I believe that Sbwaters is asking about pointability and shootability of the said shotguns. In that case a 28" - 30" O/U will roughly be an equivalent.

Because of the length of the receiver a 26" repeater will have roughly the same overall length and balance of a double 3-4" longer. It varies somewhat. It is personal preference, but I don't like a barrel longer than 26" on a repeater. That is equivalent to a 29-30" double. Even on most double shotguns I like 26-28" best.

jmr40 said:

Because of the length of the receiver a 26" repeater will have roughly the same overall length and balance of a double 3-4" longer. It varies somewhat. It is personal preference, but I don't like a barrel longer than 26" on a repeater. That is equivalent to a 29-30" double. Even on most double shotguns I like 26-28" best.

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I prefer 26" barrels too which seems to put us in the minority.

The sighting radius on my Auto-5 with 18.25" barrel is 24", which means that the receiver is almost 6" long. 1100s look about the same to me, but I haven't measured one.

I like a 26" double or O/U, and I like the length of Auto-5 very much too. I'm not much of a long-barrel guy, especially so on a pump or semi-auto.

Those silly people who shoot in competition and on a regular basis find that 30-32" barrels work best for them in Trap. Skeet and sporting clays 28-30" depending on preference. Having both O/U in the 30"-32" length and semi autos and a pump in the 26-30" range. I can tell you that the O/U with the longer barrels will help me break a few more clays out of 100. I do about 20 clays better with my O/U with longer barrels than I do with my 26-28" barrel semi autos. The O/U will be 4" shorter overall than the semi auto or pump due to the difference in the receiver length.O/U swing better,the balance feels better, and the longer barrel makes following a moving target easier. But that is just my preference. You really need to try out an O/U that fits you and compare it to your 1100 to see what works best for you.