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What Size Forend Tube Do I Need?

Hello all,

Although I see this post is quite old I was hoping to get a bit of insight if there are any lingerers around. My mossberg 500 came with the one piece polymer checkered forearm. After consulting the “Action bar length cart” provided above, I see that I need the Promag PM194 action slide. This slide is 7-5/8 inches. I also see that the second bar listed is stated the bar in the chart is “7-5/8in - 7-3/4in”. Unfortunately I’m having trouble finding a PM194 action slide and was wondering if I could use an 7-3/4in action slide instead as they’re more readily available. Much thanks in advance.
 
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