Ok, I got the barrel tig welded and properly installed and headspaced. What kind or type of end mill bit should I use? there are a bunch of different types. I will have to order it because they dont sell any within about 60 miles away. I think the barrel pin size is 5/32 but its tapered. but it seems a 5/32 drill bit will fit into the hole. I used a regular drill bit the first time.