5.45x39 is alot cheaper i can pick it up were i live for 12 cents a round but the russian surplus ammo is very dirty i think it should be a great training platform as it weighs about the same as my 5.56 ar if you google 5.45x39 upper one of the first websites has the upper for 499.99 plus 10.00 shipping to your front door i cant wait to take it to the range