Length of Pull (LOP): This is the measurement from the trigger to the end of the stock or pad
Drop at Comb (DAC): This is the measurement of the parallel line of the barrel rib to the comb, it is typically taken at the front and at the rear of the comb
Drop at Heel (DAH): This is the measurement of the parallel line of the barrel rib to the heel or top of the pad
Drop Comb: A stock configuration in which the comb of the stock drops at an angle from the front to the rear
Parallel Comb: A stock configuration in which the comb is the same drop from front to rear
Cast On/Off: A stock configuration in which the stock centerline is at a tangent from the bore from front to rear
Offset Comb: A configuration in which the comb of the stock is in a parallel offset to the bore
Adjustable Comb: A comb in the stock that has been cut and had internal hardware installed to allow the comb to be raised as well as shifted to either side to adjust pint of impact
Sideplate: A metal piece that fits next to the action, typically found on engrave actions
Side lock: An action that has the hammer mechanisms attached to removable side plates.Typical sidelock actions would be L.C. Smith, Beretta SO series
Boxlock: Typical Over / Under and Double Barrel actions that have internal hammer mechanisms
Manlincher Stock: This is a full-length rifle stock that extends about one to two inches from the muzzle