I'm looking to sell my recently R-Hopped PDI 300mm 6.05 barrel.
I'm asking $100 shipped.
This barrel was milled (hop window elongated) and r-hop patch installed by hopsystems.com. Although their customer service sucks, I believe they did an acceptable job installing the patch (based on my limited experience with r-hop). I will provide the same documentation provided to me by HopSystems.
I'm selling the barrel because I have achieved similar results with my flat-hop install and because the ProWin that was modified with this barrel did not properly sit in my upper.
Since there are a multitude of factors involved with hop up and barrel installation and tuning, I can only guarantee the authenticity of the install and the barrel and not the performance it will create for your gun.