I think you've had a nip based on your spelling and sentence structure. Whatever. If it's a 21 Duck, the l.o.p. is 13 5/8", and unless you're 5'6" tall, it is too short. What dimensions do you normally shoot? A good set of measurements for a lot of us guys is a 14 1/2"-14 3/4" l.o.p., 1 1/2"x 2 1/4" drop. Lots of variables, according to your build and how you mount the gun.
Shoot a flat of shells through it first and see how you do before assuming it needs changing. If you cannot hit anything, then it's time to see a reputable gun fitter. Good luck. 21's make great SC guns.
JR
