First, you don't need the dangerwerx arm unless your current arm brakes, in which case get one of Cheese's arms and put on your own nub. Second, for the r-hop you don't need to cut the barrel, that is for the ER-hop, which stands for extended r-hop. I have the r-hop with a nineball bucking for the air seal and it works great, although I have been wanting to get the er-hop for some time now. You only need to do the teflon mod on the cylinder head, and that is if your o-ring on it isn't doing it's job. Don't do the teflon on the bucking because the dental floss or better yet, anti-blowback rings are better (basically clamps down the bucking so no air can get out).
Cheese, I think you were looking for this:
http://airsoftsniperforum.com/showthread.php?t=4314
That's the upgrading procedure.
When you get a bar10 you should do the TDC mod to counter the right hooking issue. Even if you don't have that right curve issue it is still a good idea to do it in terms of consistency. I have a link to the guide I made in my description.
Cheese, I think you were looking for this:
http://airsoftsniperforum.com/showthread.php?t=4314
That's the upgrading procedure.
When you get a bar10 you should do the TDC mod to counter the right hooking issue. Even if you don't have that right curve issue it is still a good idea to do it in terms of consistency. I have a link to the guide I made in my description.