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Not all flash hiders fit all barrels.
Model 1 sales and some if not all Stag barrels have a 1/2-36 thread same as a 9mm AR.
most 6.8 barrels have 5/8-24 threads the same as the 308s.
most flash and brakes also have 5/8-24 thread but the 6.8 Smith vortex has 1/2-28 or 9/16-24,
Their 308 vortex has 5/8-24.
I don't know who sells a 6.8 barrel with 9/16-24 thread or 1/2-28 so who buys the 6.8 Smith Vortex?
It appears the LMT 6.8 barrels have 1/2-28 thread so be careful not to screw a 5.56 flash on your LMT 6.8.-thanks BillBond
Model 1 sales and some if not all Stag barrels have a 1/2-36 thread same as a 9mm AR.
most 6.8 barrels have 5/8-24 threads the same as the 308s.
most flash and brakes also have 5/8-24 thread but the 6.8 Smith vortex has 1/2-28 or 9/16-24,
Their 308 vortex has 5/8-24.
I don't know who sells a 6.8 barrel with 9/16-24 thread or 1/2-28 so who buys the 6.8 Smith Vortex?
It appears the LMT 6.8 barrels have 1/2-28 thread so be careful not to screw a 5.56 flash on your LMT 6.8.-thanks BillBond