Bad advise!
reason why!
if he takes it to a shop,the RFD has the right to confiscate the rifle,as it is classed a section one firearm.and by law they are duty bound to inform the police.
all depends on the shop only a fcuking tool would take your gun off of you that you bought from him n tbh if its your local shop and he knows you you will be alright ive took many a guns to my local shop that have been over including the sfs s2 pushing out 14ftlb with no issues n the horizontal makes no difference from shooting it into the ground