Rem model 11 redesign in 1930- why this change?

[bczrx]

I have figured out that around 1930 Remington introduced the 20g, and the 16g a year later.

Around the same time the cartridge stop was redesigned. It moved the 'tab' that rides the side of the extension and, when in battery, pushes out through the receiver. It moved that tab from the leading edge, near the part that catches the cartridge, to the middle, where it sits above the stop spring divot.

However, the leading edge of the stop didn't seem to change.

They also milled the stop groove on the side of the barrel extension back around .3" to align with the chand in tab location.

As a result, post '31 12g barrels won't function on a Savage 720 receiver- unless you weld in the rear of that groove.

Savage used the original cartridge stop design for the 720 series.

Browning also kept the original leading edge stop design for the Auto Five (my '48 version has the same stop as the savage and pre '31 rem 11).

Since Savage and Browning didn't change, it doesn't seem to be a stronger design/upgrade.

Yes, this happened when the 16 and 20g versions were introduced, but it was done for the 12g version also.

Does anyone know why? What advantage does the relocation of the tab give to the stop design?