This two-piece barrel is machined from high-quality aluminum, bore polished to a bore size of .505" or .495", and coated with Anodize matte black firearm finish for the perfect look to compliment your HDR50 TR50 with the best abrasion and mar resistance available, to assure your Riot Ball extended barrel looks as good as it performs. 

Details 

• Extreme fit tolerances
• increased precision
• Diameter (inside) 12,7mm
• Muffler thread
• Anti-twist protection
• attachment length 10cm
• with additional thread protection cover 
• Increase performance with further modification
  
• very high durability
• Plug and play

 FREE SHIPPING ONLY IN THE USA