i got a colt ar-its the a3 model with flattop reciever

bushmasters are good to and a little cheaper then colt

the other AR manf. i dont know naything about(like rock rivers ect)

mine is the 6721 model which is LEO marked and cost $1074.00 -best price i could find

if you get an A2 model(fixed carry handle) they are a little cheaper

the closest thing you can get to a real M4 is a Colt model 6920(unless your in the service