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The Colt Diamondback is a revolver manufactured by Colt's Manufacturing Company of Hartford, Connecticut, in calibers of .22 LR and .38 Special. Inspired by the successful Colt Python , the Diamondback was manufactured from 1966 to 1988 and was available in barrel lengths of 2½, 4, and 6 inches.
The former is known as top dead centre (TDC) while the latter is known as bottom dead centre (BDC). [1] Position of pistons. More generally, the dead centre is any position of a crank where the applied force is straight along its axis, meaning no turning force can be applied.
The PSO-1 elevation turret features bullet drop compensation (BDC) in 50 metres (55 yd) or 100 metres (109 yd) increments for engaging point and area targets at ranges from 100 metres (109 yd) up to 1,000 metres (1,094 yd). At longer distances the shooter must use the chevrons that would shift the trajectory by 100 metres (109 yd) per each chevron.