You own one and haven't fired it for accuracy?????? Get some sand backs, steady it on a 25 yard target, and fire five through it for a group. Hopefully, the sights are regulated enough to get on paper. If not, they'll need adjustment and this is the ONLY way to check for accuracy and sight in without the use of a Ransom rest.
My little 1+" .22 NAA will but five on a paper plate at 25 yards, so I'd expect maybe 4" or a little less groups out of a mini master, but I've never fired one. My mini has awful sights and a tiny sight radius, but the gun seems to be accurate, just hard to shoot it accurately.
