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