An adjustment turret (16, 102, 103) for an optical sight, the adjustment turret (16, 102, 103) comprising: a body including a cavity and an axial bore extending therethrough; an adjustment shaft threadably engaging said axial bore for relative rotation therebetween; a cap; characterized in that said cap is connected to said adjustment shaft for rotation with said adjustment shaft relative to said body and at least partially receiving said adjustment shaft, said cap being axially movable relative to said body and said adjustment shaft between a first position and a second position; the adjustment turret further comprising: a locking pin axially movable with said cap when said cap is moved between said first position and said second position, said locking pin being received in said cavity when said cap is in said first position to prevent relative rotation between said cap and said body and removed from said cavity when said cap is in said second position to allow relative rotation between said cap and said body; a detent plunger slidably disposed within said cavity, said locking pin engaging said detent plunger when said cap is in said first position to restrict movement of said detent plunger within said cavity; wherein restricting movement of said detent plunger within said cavity prevents removal of said detent plunger from a detent (280, 282) associated with said cap to prevent relative rotation between said cap and said body. a body including a cavity and an axial bore extending therethrough; an adjustment shaft threadably engaging said axial bore for relative rotation therebetween; a cap; characterized in that said cap is connected to said adjustment shaft for rotation with said adjustment shaft relative to said body and at least partially receiving said adjustment shaft, said cap being axially movable relative to said body and said adjustment shaft between a first position and a second position; the adjustment turret further comprising: a locking pin axially movable with said cap when said cap is moved between said first position and said second position, said locking pin being received in said cavity when said cap is in said first position to prevent relative rotation between said cap and said body and removed from said cavity when said cap is in said second position to allow relative rotation between said cap and said body; a detent plunger slidably disposed within said cavity, said locking pin engaging said detent plunger when said cap is in said first position to restrict movement of said detent plunger within said cavity; wherein restricting movement of said detent plunger within said cavity prevents removal of said detent plunger from a detent (280, 282) associated with said cap to prevent relative rotation between said cap and said body. a locking pin axially movable with said cap when said cap is moved between said first position and said second position, said locking pin being received in said cavity when said cap is in said first position to prevent relative rotation between said cap and said body and removed from said cavity when said cap is in said second position to allow relative rotation between said cap and said body; a detent plunger slidably disposed within said cavity, said locking pin engaging said detent plunger when said cap is in said first position to restrict movement of said detent plunger within said cavity; wherein restricting movement of said detent plunger within said cavity prevents removal of said detent plunger from a detent (280, 282) associated with said cap to prevent relative rotation between said cap and said body.