Putting a 700 or 800 mm barrel on a Rapid.

[etiam viviens]

Did anyone ever did place a 700 or 800 mm barrel on a rapid/Raw.
Planning to put an .30/.25 700mm barrels on a rapid and was wondering if someone did this before and if what are the problems with doing so.

My Rapid now is FAC and does about 80 joules with .25 jsb heavy
Planning to shoot with slugs an so I want to place an unchoked barrel.
Replacing the 60cm barrel with a 70 or 80 cm makes no difference in cost, blank is 80 cm and the machining cost stays te same.

I will be shooting from the bench so weight and handling would not matter.
Do understand the gun will be top heavy.