Steve David is right, the M40 series is just a damn fine gun. I shot a reporduction model by Texas Brigade Armory,,,,,,,,, that didn't suck! Its the most realistic reproduction I've ever seen of the real thing. Don't know if I would dump the cash on the UNERTL scope, better stuff out there for that kind of money. Unfortunately, the gun would just not be the same without the UNERTL glass.
Now,,, there was the odd "original" UNERTL scope that hit the "Civi" market, so to speak. If a guy could find one of those, OOOOOOO MMMMAAAAAANNNNN, that I could not pass up.
The M40A3 is also a very functional rifle, the downside being that it weights in at something crazy like 19lbs. Thats a lot of bang stick to drag around.