Having taken the build from my friends own personal weapon (101st Airborne) I would have to beg to differ. US Snipers can change the grip to whichever they prefer and, whilst a leupold is the scope supplied by the Army, the sniper can replace it with one of their own should they so wish (and as long as their own CO approves it). The only thing different on mine is the LAM unit, there's no way I can get the military issue unit he has, the company are not even allowed to export outside the US.
And I'm not entirely sure what you mean by the receiver ? The SR25 is the CIVILIAN designation of