For: MadBull Ver. 2 Precision Inner Barrel for MC51 (407mm)Product Information:
I purchased this barrel for my KWA CQR Mod 1. The barrel is a little longer than the stock barrel but it is still within a 1/4 inch of the tip of the factory flash suppressor. The barrel is black and is not very noticeable from the outside. I tested the barrel and I am getting A LOT better accuracy and distance than the stock barrel using .28 bbs. I will let you know that it is a tight fit sliding it into the stock outer barrel but I like that. I have upgraded my cylinder, piston head, and spring (m130). I haven't conducted a chrono on it yet but I was getting 380fps prior. I will have to see how long the teflon coating lasts.
Snug fit inside outer barrel (good for me)
Great accuracy and distance over stock
May increase FPS
Teflon Coating (will it last??)
May need outer barrel modified due to increased diameter for some