Would a bayonet fit correctly on a 16" barrel with an intermediate gas system?

A bayonet will fit just fine on a 16" midlength AR.

No.

This is the fit of a standard M7 bayonet on my midlength gas system 16" barrel, other bayonets shown are USMC OK-3S bayonet on top and another M7 Imperial at bottom.




Standard bayonets would not fit correctly on a 16" barrel with intermediate gas system, take a look at my picture with a midlength gas system same barrel length of your question.

If you would move the bayonet forward toward the muzzle approximately 1.5", the muzzle ring of the bayonet will not contact the flash suppressor (I'm using a longer than a standard A2 flash suppressor).

However you could shorten the handle of the standard bayonet and as long as the muzzle ring of the bayonet is attached to the muzzle device, then it would work.

Most of the intermediate gas system that I know the gas hole are generally located 1.5" toward the chamber compared to a rifle gas system.

What is the location of the gas port on the barrel of the intermediate gas system that you are talking about compared with a rifle gas system?


Happy holidays

Thanks for the info.  So I guess if I wanted to attach one it might just be better to the the 14.5" M4 SBR which would fit as designed.... correct?

Here's a standard USMC OK-3S bayonet mounted correctly on 14.5" M4 carbine gas system barrel (not mine, pic from quarterbore).




Correct, see the picture.

For more info on various modern bayonets visit Quarterbore.net.

Or avoid NFA all together with a mid-length and get an extra 2" of handguard to boot.

+1

Also add in the ability to remove your flash hider and install a muzzle brake or another flash hider. In addition, it's good to take off your muzzle brake/flash hider once in a while to check for rust as solvents and all kinds of nasty can get trapped in there like this poor fella from another thread: