Maybe...
The only reason I could concieve for a required short forcing cone would be pressure need to operate an auto shotgun.
The shorter forcing cone could create more pressure.
On a pump I can't think of a reason.
Are you going to do the work yourself?
I had Gobbleguns in Batesville,AR lengthen the forcing cone in a 10 gauge.
They were the first person I found who would/could do 10 gauge.
They did a great job.(also ported the barrel)
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