I love the names given for certain classes of guns.
Kit gun= small , usu .22 hand gun. examples being 34, 63, Bearcat, ruger semi, browning buckmark, S&W 22.
Truck gun=4" barrelled revolver 10, 13, 65, 64, ruger securitysix/gp100, M&P-Glock, etc
Boat (small) gun=see truck gun but in stainless-see also kit gun but in stainles and at least 4" barrel.
Boat (large) gun = 870-mini 14/AR clone
Not that this is definitive-just what pops into my mind.
For me-my Kit gun is a 63 or my 317. My boat/truck gun is a DAO 64. My big boat gun is my 870.