Thinking about the hassle of securely clamping a typical AR15 barrel to install a muzzle device - requiring either a special barrel vise (which may require rosin to hold, and may mar the barrel anyway), or a Geissele reaction rod or similar tool which supposedly isn't ideal anyway (depending on the greater torque between the barrel extension and barrel breech threads), or the bad-idea method of using receiver blocks, or the effective garage method of clamping a pinned gas block, if you have one... why don't barrel makers just machine two wrench flats near the muzzle (obviously, behind the threads) so you could install and remove muzzle devices with two ordinary wrenches and no special tools, not even needing a vise of any kind? It would eliminate torque on anything other than the barrel itself, would make installation and changes super easy, and would cost maybe a dollar in machining when the barrel is being made. FN-FAL barrels have wrench flats near the breech so they can be installed without a barrel vise. M4A1 profile barrels already have a flat machined spot under the handguards. Why not put two little wrench flats on the barrel itself?


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