I should have just stayed with the old stuff. But the below American Rifleman article is the source off my statement. I found it while researching a shotgun for my wife who needs a lighter gun. But injury ended that search early.
https://www.americanrifleman.org/articles/2013/7/23/gentlemen-this-is-the-new-model-1100/
"Through 1969, all 20-gauge Model 1100s were built on the 12-gauge receiver. A Lightweight version with a mahogany stock was offered, but it still weighed only a few ounces less than a 12-gauge gun. Skeet shooters absolutely loved the weight for its reduction in recoil, and even today those guns bring a premium on the used gun market, if one can find one.
The standard 12-gauge Model 1100 weighed 7 pounds, 8 ounces, while the magnum version weighed a quarter-pound more. Target shooters and hunters were quite happy with those weights but most hunters considered the 20-gauge gun on the 12-gauge receiver heavier than necessary. And since hunters were buying far more shotguns than were clay target shooters, the Lightweight 20 on the 28/.410 receiver was introduced in 1970.......
........Jay Bunting of Remington, who shot skeet with 1100s for many years, recently pointed out to me that the Lightweight 20 was made in two versions. The LW-20 offered from 1970 to 1976 had a short barrel extension much like the Model 870, while the LT-20, which replaced it in 1977, had a standard-length extension with integral ejection stud and an enlarged ejection port. Both versions were originally chambered only for the 2 ¾-inch shell, but in 1971 the LT became available with a 3-inch chamber."
Actual weights were never mentioned and I made 2 assumptions. That the LW on the 28/410 frame was lighter and that the LT was still on the 28/410 frame.
