If he actually told Preston that he wasn't good at using a gun, then he would have been given a questioning look that would have said 'really?' Still, Equius wouldn't really get to see exactly how the weapon worked at the moment as Preston was just about finished putting it togeter. And a panel there, a screw here and a bolt there. And within about another minute or so Preston had finished rebuilding his rifle with a sigh of relief.

"Finally got that done and out of the way..." Now all he had to do was load a magazine into it and he was good to go.