Yeah, its going to be relatively critical now the quality of ammunition you use in that gun. With that tight of a bore you will be restricted to high quality bb's. .30 or heavier (calibre is 6mm regardless) BB Bastard or other high quality brands will be your best choice.
I've no idea what the rest of your gun's internals or like, but it sounds like you'll need to do some upgrades in other areas as well to really make that gun work like it should.
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