Found these in my old man’s accessory box.

[blumpsicle]

Found along with other m11 accessories. Any ideas what they’re for? Cobray marked.

 

[strobro32]

Barrel wrench for the M10, M11, M11/9.

 

[prescottkid]

Barrel wrench

 

[har1340]

I believe typically two of these type wrenches are required for BBL removal. Please correct if needed...

 

[Concorde]

Yes, takes two. Here's an example with three barrel thread sizes:

Cobray MAC Barrel Removal & Installation Wrench Set

Check out the deal on Cobray MAC Barrel Removal & Installation Wrench Set at FTF Industries

www.ftfindustries.com

Sam at Practical Solutions has them too, and also has a video of how to use them:

Barrel Tool for all MACs – Practical Solutions

macmachineguns.com

 

[strobro32]

It take one to instal. Two to remove.

 

[MitchWerbellsGhost87]