The Blue Line Mauser M20 is a semi-automatic handgun chambered in .22 LR with a 4.7-inch barrel. It ships with a 10+1 round capacity and comes in a Robin Egg Blue and black two-tone finish. The compact pistol carries the M20 designation. 
 

Key Specifications 

• Brand: Blue Line 
• Model: Mauser M20 
• Caliber: .22 LR 
• Action: Semi-Automatic 
• Capacity: 10+1 rounds 
• Barrel Length: 4.7 inches 
• Color/Finish: Robins Egg Blue/Black 
   

Detailed Features 

• Semi-automatic operation chambered in .22 LR 
• 4.7-inch barrel 
• 10+1 round capacity 
• Robin Egg Blue and black two-tone finish 
• Compact handgun configuration

Owners of the Blue Line Mauser M20 appreciate the Robin Egg Blue finish, which sets it apart from the typical matte-black semi-auto at any range. The .22 LR chambering keeps shooting affordable, and most find the 10+1 capacity adequate for plinking.

Ergonomics get mixed marks. Shooters with smaller hands find the grip comfortable; those with larger hands note it feels modest. The 4.7-inch barrel gives a reasonable sight radius for a handgun of this size, and the iron sights are usable without modification.

Value opinion is split. Some buyers view the M20 as a fun, affordable .22 LR pistol with a distinctive look. Others feel the overall fit and finish is acceptable but not impressive, and the trigger pull draws the most consistent criticism, with many owners wanting a lighter reset out of the box.