Until 1977 the 20 (and 16) gauge 870 and 1100 gunswere built on the 12 ga frame. One can readily see the step down to the smaller bore when looking where the barrel exits the receiver. My first 870 was such a model in 20 ga which can now be a bear to find barrels for as it is 40 years since they were last made and not many were produced. The larger frame 20s were very popular on the skeet field at one time and still make for a light recoiling un for beginners or high volume shooting.
After 1977 Reminton began using the smaller frame for the 20 ga but there were two primary versions, the LT and the LW, which had different barrel hangers making them not interchangeable. I'm not sure on the order but I think the LT came first with the LW replacing it a few years later. The second version is what is currently available though the letter designation was dropped.
I think the current 870s are still well made though they may not be quite as well fitted as decades back. Then again, little else is as the cost would be prohibitive. For what is available new today I think one will not surpass a new Wingmaster in quality.
True this^^^. I have a 1975 870 WM in 20ga. It is indeed built on the 12 ga frame. I have two barrel's for it, both have that "step down" you refer to. Both barrels are fixed chokes. Mod and I/C. Friggin' great gun.
