Quoted: To remove and install a barrel do you recommend a multi-tool like DPMS or just use the USGI tool with a torque wrench.
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You can use either. If you read the thread tacked at the top... you will understand why a torque wrench is not required. It doesn hurt for the incredibly anal, however.
To grease up the threads, I know everyone says to use moly grease but I bought a bushmaster armorers DVD and they assembled using only motor oil on the threads.
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The bushmaster video is fine. However, it does not follow the TM in that respect. The point is to get a wet torque setting, and to stop any binding/galling during the tightening of the barrel nut. Using Moly Grease (or any generic high temperature grease) will ensure that the barrel can be disassembled in the future without any damage to the upper receiver threads.
(just an FYI, bushmaster used a USGI tool and torque wrench for the barrel nut)
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Which isnt bad... but I dont consider Bushmaster the authority on barrel installs.... nor do I know that they actually use the same methods in their video... in their shop.
If I don't need moly grease then I won't buy any but that seem to be the standard here. A lot of people here also say not to waste money on a torque wrench, and just use the multi-tool until tight.
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I use grease (a $1 tube will last your lifetime) and do NOT use a torque wrench.
They also did not use an action block but used a barrel vice but I am going to get an action block.
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That shows how old and outdated that video, or armorer is. That is the old way... and puts stress on the barrel extension indexing pin to the uper receiver slot... which increases the likelyhood of a canted FSB. Get an action block.
I have to buy everything to do this so keeping the "extra" tools that I don't need off the list would save me some cash.
Any suggestions would help. Thanks
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I suggest you read the thread tacked at the top, which pretty much covers all of this.