go to psa's website and search for one you like. most of them are under 800. plus shipping and fees. or go to a lgs and look for smith n wesson mp15's theses are generally near the 600-700 mark. that way u can buy mags, and ammo.
I have been a silent witness
to all of America's finest hours.
But my finest hour comes
when I am torn into strips and used as bandages
for my wounded comrades on the battlefield,
When I fly at half-mast to honor my soldiers,
Or when I lie in the trembling arms
of a grieving mother
at the graveside of her fallen son.