[HART1]

I am building a V51 pistol and I am going to use a MP5 forearm. I am waiting on a forearm to be shipped to me, but my barrel is already at the machinest. I need to know what the distance is between the face of the trunion to the center of the pin hole thats mounted to the cocking tube, so I can tell the machinest what lengh to cut my barrel. Or what the distance is between the face of the trunion and the receiver side of the front site, aka tripple frame.
Thank you
Kenny Hart
[email protected]