The Beeman/FWB 603 is a next generation single stroke pneumatic. The cocking stroke was designed to flow with the body. The large handle fits the palm comfortably, and the power stroke is towards the shooter, not awkwardly away as some other brands. Consequently, cocking the Beeman/FWB 603 is much easier than other single stroke pneumatics leading to less effort which can raise the heart rate, tire the shooter, and lower the scores.

One of the most unique aspects of the rifle is the laminated stock. This handsome stock is constructed from hardwoods and hard rubber. Each layer is cross laid to each other and the result is a stock so rigid that stability is assured regardless of humidity or temperature changes. Wood gun stocks absorb moisture or dry out causing subtle changes in shape and altering the point of impact, but the 603 stock completely eliminates this problem. Feinwerkbau even tested the materials by holding a stock underwater for days, and it still held it's shape! There is even an improved three point mounting system for the action.

The cheek piece and butt plate are now more adjustable than ever. Not only can the cheek piece be moved up or down in a full 30mm range but can also be canted top to bottom or bottom to top by 20 degrees. The left to right can be canted 15 degrees and the entire unit can be moved 5mm left or right. The butt plate has a similar range of adjustments making this rifle a custom fit to any shooter of any size or shape.

Feinwerkbau airguns have always been recognized as having some of the finest triggers ever designed, and the 603 is no exception. Pull weight adjusts from approximately 3.5 ounces to a bit more than a pound, and there are adjustments for pull-off point, initial travel, finger length, and even lateral position. Now both the trigger and trigger slack weight are separately adjustable with small knurled knobs located in the trigger guard. Adjustments can be made with the turn of a finger, no tools are required, and even be changed in the middle of a match! A new dry firing device has been included for easy practice of position and trigger control, and a lighter firing pin gives an even faster lock time than before.

The 603 appears to have a long 25 inch barrel, but in reality that is only a shroud. The rifled inner barrel is only 16.6 inches long with the remainder a wide, hollow tube that does not touch the pellet once it leaves the rifled barrel. So what is the advantage of the short barrel? The answer lies in shooter motion once the shot is fired. The longer the barrel the more opportunity the shooter has to move, even ever so slightly, and to pull the rifle off the target. The three barrel weights on the end are moveable allowing the shooter to balance the rifle to their preference. Finally a new front sight with an increased aperture was added.