My running theory right now is that this action tube is for a longer receiver, 3-1/2" or a mossberg 835 as suggested by a gentleman from Halvin Sales.
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I have tried a 7-5/8" and a 6-5/8" forend action slide tube and neither of them work for my 12ga, Maverick 88 20in Barrel. The arms on the action tube look are too long compared to my stock single piece molded forearm to engage the cartridge stop to feed the elevator assembly. This prevents the new round from feeding when ever I use the pump.
The 7-5/8" forend I used is P/N# 53170A.
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Has anyone run into this issue?