Bayonet for colt m4 carbine

Firefighter88 · February 7, 2014, 05:24 PM

I received a bayonet as a gift for my colt m4 carbine. It barely won't fit over my flash hider. Kinda want some opinions and advice. I hope this is the right place for my topic. I thought about filing the inside of the bayonet ring so it will fit over the flash hider but I don't know if there is a specific fit or proper fit. I don't want to ruin the bayonet either. Thanks!

chiefr · February 7, 2014, 07:59 PM

No bayo will fit if you want the blade flush with the barrel end on a LE6490 that I know of.
Frankly, I do not know why the bayo lug is there. On the other hand, there are some custom bayos out there.
IMHO, I would just leave it alone.

Firefighter88 · February 7, 2014, 08:42 PM

It's a le6920....but ya that's what I have heard. Thanks for the input

Quentin2 · February 7, 2014, 10:34 PM

Assuming carbine length gas, the bayonet lug is located to work with a military length M4 barrel, 14.5", not the 16" barrel (the shortest rifle barrel we civilians can legally get without a tax stamp). I haven't given much thought to solutions, hopefully someone can help you.

However, the midlength gas system does position the bayonet lug so it will work with a 16" barrel.

kraigwy · February 8, 2014, 03:33 PM

I'm assuming you're talking about the M-9 bayonet, the bayonet for the M16a2 though the M4.

This is what it looks like on the M4. If you have a 16 inch barrel then you can expect the barrel to extend another 1.5 inches.

You're not gonna hurt the m-9.

I have all the bayonets for US rifles from the Krag to the A2. The M-9 (shown) is the most handy. I keep mine in my 4 Wheeler for emergency fence repairs. Wire cutter on this puppy works better then any fencing pliers I've used. Heavy enough to dig with.

JimDandy · February 8, 2014, 03:54 PM

Gotta agree a lot with that last post. If you're putting a bayonet on a SA Rifle/Carbine and need it to function as a bayonet, you've got bigger problems than how well it fits. But they are incredibly handy utility knives for camping/survival etc.

Ridge_Runner_5 · February 11, 2014, 01:59 AM

A 16" barrel with a midlength gas system will hold one fine, though.

February 7, 2014, 05:24 PM	#1
Firefighter88 Member Join Date: July 3, 2012 Location: Oklahoma Posts: 71	Bayonet for colt m4 carbine I received a bayonet as a gift for my colt m4 carbine. It barely won't fit over my flash hider. Kinda want some opinions and advice. I hope this is the right place for my topic. I thought about filing the inside of the bayonet ring so it will fit over the flash hider but I don't know if there is a specific fit or proper fit. I don't want to ruin the bayonet either. Thanks!

February 8, 2014, 03:33 PM	#5
kraigwy Senior Member Join Date: June 16, 2008 Location: Wyoming Posts: 11,061	I'm assuming you're talking about the M-9 bayonet, the bayonet for the M16a2 though the M4. This is what it looks like on the M4. If you have a 16 inch barrel then you can expect the barrel to extend another 1.5 inches. You're not gonna hurt the m-9. I have all the bayonets for US rifles from the Krag to the A2. The M-9 (shown) is the most handy. I keep mine in my 4 Wheeler for emergency fence repairs. Wire cutter on this puppy works better then any fencing pliers I've used. Heavy enough to dig with. __________________ Kraig Stuart CPT USAR Ret USAMU Sniper School Distinguished Rifle Badge 1071

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February 7, 2014, 07:59 PM	#2
chiefr Senior Member Join Date: January 27, 2010 Location: AR Posts: 1,401	No bayo will fit if you want the blade flush with the barrel end on a LE6490 that I know of. Frankly, I do not know why the bayo lug is there. On the other hand, there are some custom bayos out there. IMHO, I would just leave it alone.

February 7, 2014, 08:42 PM	#3
Firefighter88 Member Join Date: July 3, 2012 Location: Oklahoma Posts: 71	It's a le6920....but ya that's what I have heard. Thanks for the input

February 7, 2014, 10:34 PM	#4
Quentin2 Senior Member Join Date: June 18, 2009 Location: NorthWest USA Posts: 1,996	Assuming carbine length gas, the bayonet lug is located to work with a military length M4 barrel, 14.5", not the 16" barrel (the shortest rifle barrel we civilians can legally get without a tax stamp). I haven't given much thought to solutions, hopefully someone can help you. However, the midlength gas system does position the bayonet lug so it will work with a 16" barrel.

February 8, 2014, 03:54 PM	#6
JimDandy Senior Member Join Date: August 8, 2012 Posts: 2,556	Gotta agree a lot with that last post. If you're putting a bayonet on a SA Rifle/Carbine and need it to function as a bayonet, you've got bigger problems than how well it fits. But they are incredibly handy utility knives for camping/survival etc.

February 11, 2014, 01:59 AM	#7
Ridge_Runner_5 Senior Member Join Date: February 8, 2008 Location: Denver, CO Posts: 1,925	A 16" barrel with a midlength gas system will hold one fine, though.