Will you guys help me out, I have a little project going on to attach a cool bipod to the tube .
So will you tell me what is the inside diameter of the tube?
Here is the upper I am talking about:
http://www.rainierarms.com/img/shop/product/54ffee337561d808c5e7158851dc5b86.jpg
So will you tell me what is the inside diameter of the tube?
Here is the upper I am talking about:
http://www.rainierarms.com/img/shop/product/54ffee337561d808c5e7158851dc5b86.jpg