Barrel Threading

They are either imcompetent or they just don't want to do it. The 556 barrel is threaded into the receiver just like many other weapons. It is somewhat like an AK variant more than an AR-15 (AR's use a barrel nut and the barrel itself has no threads. The 556 just threads into the receiver. I would say that they are copping out of threading it because they are afraid that you will add a non-compliant flash hider (OOOOOOO naughty!)
Find someone that will and have them pin your brake to make it legal...

smiles1014 said:

I have a MA compliant version of the 556 with no flash hider and A2 stock. I would like to get the barrel threaded to permanently attach a compensator. Has anyone tried doing this via a gunsmith? Any luck? Who did it? I have contacted several gunsmiths in MA and they all have said they cannot due to the way the barrel is attached to the receiver. Can anyone shed light on this?

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To remove the barrel from the rifle you would need to fabricate a receiver wrench . This can be a very time consuming process. If the wrench does not propperly fit the receiver you can damage and or ruin the receiver. If a gunsmith has to spend a few hours to make the tools just to get the barrel off its not very cost effective. This is especially true if he is only going to do one rifle of that type.My guess is he passed on doing the work just for this reason.

This place will do it for you and pin the compensator / flash hider, They are based in ohio and reasonably priced and do great work. You just have to ship the upper to them
http://www.adcofirearms.com/shopservices/

Also you may want to try http://www.laroccagunworks.com/ in Worcester

toolmaker hit the nail on the head. Therein lies the problem, getting a gunsmith to make the tool required to separate the receiver from the barrel. Unless I wanted to spend crazy money for someone to make this tool I am outta luck. I am going to contact Adco to see if they already have this tool. Thanks for all the replies!

Any luck on this?

VISE grips

I used a pair of vise grips and a pipe wrench and was able to get the barrel off. I messed up the outside of the barrel, but I was able to thread it using some old nuts I had in the garage