The Feinwerkbau 601 is a .177 calibre, single-stroke pneumatic target air rifle known for its precision and adjustable features, particularly in the realm of target shooting. It was a modified version of the FWB 600, distinguished by the addition of a cocking lever safety device. 

Here's a more detailed breakdown of the Feinwerkbau 601 specifications:

General:

• Manufacturer: Feinwerkbau (FWB)

• Model: 601

• Type: Single-stroke pneumatic target rifle

• Caliber: .177 (4.5 mm)

• Production Years: 1987 - 1995 

Physical Characteristics:

• Weight: 9.9 lbs (approximate)

• Length: 51.2 inches (approximate)

• Barrel: 25-inch round barrel

• Stock: Laminated wood

• Finish: Typically blue 

Performance:

• Velocity: 585 fps (approximate)

• Muzzle Energy: 5.0 FP (approximate)

• Accuracy: Excellent, often cited for its precision in target shooting

• Cocking Method: Sidelever

• Cocking Effort: 19 lbs (approximate)

• Trigger: Match-adjustable

• Safety: The 601 features a cocking lever safety that prevents the lever from springing back during cocking, according to the Feinwerkbau website.

• Rifling: 12 grooves 

This Rifle is in Excellent Condition for its age. The rifle has been Fully Checked and Tested with valve and Piston seals replaced and a full internal clean.