fly or jeff would be your men for proper techy advice but the bolt needs greased (i use shocker lube) pretty regularly and i think the manual says after 10 000 shots but i could be wrong about that ..other than that i dont think you'll have any probs .its all in the manual matey
dm4 will shoot as well as an ego easily and i personally think dm's are more accurate than ego's ..only difference is size and weight matey the dms a little heavier to lug around ..