Hey guys, there's a guy in my area who has a two year old New England Firearms .50 caliber up for sale - synthetic stock, stainless steel barrel, along with an "ammo box" (?), cleaning supplies, powder and bullets. Price seems to be reasonable.

I'll probably buy it to play with. But I need to know what I'm getting into.

First off, I think I read here or on another forum that the NEF guns had some kind of spring contraption for holding the primer, and/or there were two types of breech plugs (an original and an improved model). Does anyone know anything about this?

Secondly, does anyone have a feel for what a reasonable price would be for such a gun (assuming very good condition)?