I'm curious if there's any 16ga Pumps that are built on a smaller frame than their 12ga brothers?

Not sure about current offerings if any, Winchester model 12s in 16 were on the same size frame as the 20s

Ithaca 37s made in Ithaca and Kings Ferry.

I'm 99% sure that the Browning BPS was on a smaller receiver.

I believe browning Citoris are on a 16 ga frame.

Original 1912 Winchester 16's were medium sized frame same as the 20 and 28 gauge guns. 12 gauge used either the Magnum or Standard frame . I have a 1913 model 1912 in 16 gauge that takes the short shells.

I love carrying my Ithaca 37 in 16 gauge. Very light. As stated above, it is built on the 20 gauge frame.

My oldest son who lives just west of Pittsburgh, PA inherited a 16 gauge model 12 Winchester from his grandpa on his mother's side. He and I hunt a lot of pheasants together each fall in PA. If there's a better gun to carry all day hunting small game I don't know what it is. That gun is a joy to carry.

I'm a big 870 fan but a 16 gauge model 12 is just about pump shotgun perfection for 90 % of what I use a shotgun for.

On my bucket list is a model 12 16 gauge in good shape, for what little shotgun shooting I do. Pure class on a working man's budget!

Remington 31 and Ithaca 37 are the first to come to mind. I could never get over the Winchester's safety location. Marlin model 90 isn't a 12 gauge frame either if you want to add O/U to the list.

The Ithaca's action was only very slight shorter in depth than the 12-gauge action. I've owned both and measured them.

Have owned and hunted a bunch of other 16s, including a Model 12 from the 30s with a 26" modified choke in a rib-free barrel. It was a great, light, good-handling gun--but didn't fit me as well as some others, so eventually went down the road.

The 16s I have now are double or drillings....

Ohh - a Rem M31 in 16 would be amazing.

Would also add that New Ithaca doubles in 16 also had a smaller action than the 12s. Know this due owning one of each.

12 gauge 870s were built on 16 gauge 11-48 receivers, therefore 16 gauge 870s were also built on 16 gauge frames.

Never seen a pump action citori.

I was u der the impression that the Ithaca 37 was built on a 20 gauge frame. Check with the Ithaca forum

Rem 870s were developed from a modified 20 ga 11-48 frame, not identical to 11-48.

From what I've seen the 37s built in Ithaca and Kings Ferry used the same frame size for 20 and 16 ga, with appropriate mods to fit the different size magazine tubes, barrels, and whatever else was gauge specific. 12 ga frames were larger. I have both 16 and 12 ga 37s (non-magnum) and they are definately different frames.

Don't know if its the same for the newer guns made in Ohio.