I do not own specifically the MB04, but i have the MB05, the only difference in the butt stock is adjustable... Anyway, it serves as a great rifle for out in the field, i have the spring version (which i think is the only version) and i can shoot out to about 100 yds accurately enough to hit a man sized target. If you do happen to purchase it, make sure that you clean the barrel out because all the grease will really screw up your shots. I had a problem with that and i posted on here about it, but all you really need to do is ball up a piece of paper towel and push it down your barrel with the unclogging rod you get with the package, after a few times, it should be working fine.