Geissele ar-15/m4 reaction rod 10-169 - Geissele AR-15/M4 Reaction Rod

I have to admit,I have a lot of money in tools for the AR.But,this is hands down the best tool in my collection for working on an upper!Period.Way better than a vise block that can leave marks on your upper.You can index the upper around on this tool to get it in any position you need for what ever you may be working in,or on the upper.Don't know how I got along without it for so long.I'll never be without this one or the longer version of this tool again.And with this tool,along with proper use,you'll never twist a receiver torqing a barrel nut.Don't work on an upper without some version of this tool again if you value your upper.