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The 11-48 looks similar to the mod 58, 1100, 11-87 but used a Browning recoil type action similar to the A-5. It has a recoil spring under the forend with friction rings to adjust for light or heavy loads. It also has a recoiling barrel like the A-5.
It was a very popular skeetgun back in the 50's & 60's, and was availible in 12, 16, 20, 28, & .410.