Longer .25 Marauder Barrels/Higher Calibers.

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Mountain Air makes longer barrels and .30 Cal conversion for the Mrod. 
 
Keep in mind if you change the barrel to a non-standard length, it will require you to get a custom made shroud to keep the new barrel as quiet as the original.

yep I got that part covered. I'm trying to make a 100fpe gun and I like .25 so I want a longer barrel to crank up the velocity. I'm getting around 80fpe with 59 grain NSA ammo with the cothran valve and I know I'm most likely going to have to drill a larger transfer port hole to get it too 100fpe. I will have to pick up this project again when I go on winter break.