It's mostly bad because it's so long, the weight isn't an issue per se, it's more about the balance. Holding the front end up for a long period of time just wrecks. It's going to very much be a precision, bipod, prone fire weapon.
although with the laws of moment (this is going back a bit, quit physics ages ago) his will probably be harder to hold fully out depending n where most of the weight is.. oh and *Nickona