So I have a Mossberg 500A from Big 5 that I am attempting to turn into a tactical shotgun. I purchased a new action slide assmebly in a 6 5/8" along with a new tube nut so that I could retrofit a Mako picatinny forend onto the shotgun.
The problem is that the tube assembly seems a bit too short for the forend. I am unable to thread the tube nut onto the slide as it isn't long enough to expose the tube's threads.
Mossberg also sells a 7 5/8" tube assembly at the time I was pretty certain that I needed the 6 5/8" but as it appears that I was wrong. The tube nut is supposed to thread on the OPPOSITE side of the action assembly to properly secure the forend correct? Thus I should exchange this 6 5/8" tube for a 7 5/8"?
Here are some pics to help:


Thanks guys
The problem is that the tube assembly seems a bit too short for the forend. I am unable to thread the tube nut onto the slide as it isn't long enough to expose the tube's threads.
Mossberg also sells a 7 5/8" tube assembly at the time I was pretty certain that I needed the 6 5/8" but as it appears that I was wrong. The tube nut is supposed to thread on the OPPOSITE side of the action assembly to properly secure the forend correct? Thus I should exchange this 6 5/8" tube for a 7 5/8"?
Here are some pics to help:


Thanks guys

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