Yeah. Two things need modified to make the nitro fit because
1- The mounting plugs don't fit in the square holes on the receiver.
2- The barrel mount won't fit onto the barrel.
I successfully free-float mounted a nitrovo by pouring acrilic resin into the square reciever holes, it hardens and makes a removable mounting plug that actually fits and can be taped into with a few screws. And 2, machining a little truncated triangle of aluminum so the aft top of the nitrovo rests against the front of the receiver. That was enough to make it rock-solid.