Younggun,I sujest you let your pup see plenty of your gun but don,t shoot near him for a while,leave it beside the bowl when you feed him,even play with him while you are carrying the gun.Once he has got used to seeing it around then wait until he is doing something he really likes,eating or playing,fire one shot away from him,NOW IMPORTANT,what ever he does ignore him like nothing happened,just put the gun down an carry on like nothing happened.If he shows fear and you
try to reassure him he will take it as a sign that something IS wrong,so if he shows fear just ignore him for about sixty seconds.After this time call him to you give him a pat or more food an then just carry on casual like.
Don,t make a fuss over him or lead him to think anything is out of the ordinary.Remember he is looking to you for his lead so if you don,t make a big deal he should,nt see anything to be scared of.You might even fire that first shot or two out of his sight.Another thing you could try at the same time is to get some food he really like an fire one shot away from him an then what ever he does throw him a bit of meat,If he is a bit hungry at the time it helps.Just shoot,feed,shoot, feed,ect.You might try shooting subsonic amo as well for a while. What ever you do don,t try to reassure him when he shows fear,just stop shooting and wait for him to calm down a bit then carry on like nothing happened.It works like you are praiseing him for showing fear an you must avoid doing that or thats what he will learn.Take it real slow there ain,t no hurry.Buy your self a book or two on canine behavior.BEST OF WISHES..JACK.