Thanks all for the comments. I get to see it in just a few days in person. I don't think it is a Colerain due to it having square-bottomed rifling. There may be some Colerain barrels out there with square-bottom rifling, but I haven't heard of it. (There's always an exception, it seems in life.) From what you all have told me, it confirms 99.5% now it is a Green Mountain. The nice thing is I am able to test it out a few shots. Also, you have let me know that the TOW house brand is always good quality regardless of who they contracted with at the time. I appreciate it. If the rifle fits me, it may be adopted.