M4 R muzzl comparison
Top: 14.5" w/permanent xtended A2 FH
Bottom: standard 6920 16" barrel
You can see the difference in the location of the first "joint" of the FH which is what supports the muzzle ring on the M7/M9 bayonets, the original 16" barrel has this joint too far forward.
Bottom: standard 6920 16" barrel
You can see the difference in the location of the first "joint" of the FH which is what supports the muzzle ring on the M7/M9 bayonets, the original 16" barrel has this joint too far forward.
Other Sizes: Original