I have a 223 upper that I am converting to 6.5 grendel. I have stripped the upper completely down and the 6.5 bolt and barrel are on the way. I do have a couple questions about the assembly... 1. Barrel - I have read that you need to put anti seize on the new barrel (where it connects to the reciever) and on the barrel nut. Is there a specific kind I need to use? 2. Gas block - the current block is a set screw mounted one. I really don't want to try and dimple the new barrel (don't have a drill press). So I was going to pickup a "clamp" style one. I would assume the threads would need to be loctited. I know there are several kinds or loctite. Any specific one for this application? Also are there any other parts that need to have loctite (flash hider, etc)? Anyone have any helpful advice for the assembly process. This is be my first complete upper take down/assembly... Thanks!