Bayonet Lug on an M4 type AR?


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Bill2e
March 4, 2009, 07:11 AM
What is the point of the Bayo Lug on the 16" Carbine M4orgery?

(other than to pi$$ off the ainti's, which is fine with me)

Seriously thought does someone make a Bayo that actually fits the rifle? the lug is so far back that the ring sits on the barrell and not on the edge of the flash hiddder like on the 20" model.

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Zach S
March 4, 2009, 07:43 AM
A few companies make various accessory attachments that fit the bayonet lug. Bipod, light, laser, etc.

They're pretty useless on mine, two dissipator style uppers and a 9mm Carbine (that I'll convert to a dissy someday).

But the main reason all of my ARs have them is that they weren't allowed for ten years, and the fact they are now ticks off the antis. Just like the shoulder thing that goes up.

To the best of my knowledge, no one makes a bayonet that fits the cars or midlengths. Oddly enough, I have seen them for dissipators.

Bill2e
March 4, 2009, 07:58 AM
But the main reason all of my ARs have them is that they weren't allowed for ten years, and the fact they are now ticks off the antis. Just like the shoulder thing that goes up.



And that is all the reason i need.

Schutzen
March 4, 2009, 08:02 AM
Bayonet lugs and bayonets are extremely useful in the field.
You can affix your bayonet to your rifle and jab the bayonet into the ground to hold your rifle off the ground keeping high and dry.

Other than that, they are somewhat archaic.

Just a very old Grunt!

Bill2e
March 4, 2009, 08:05 AM
I see the usefullness, but a Bayo won't fit on a 16" barrel. I would like to have one that would fit properly.

Gary G23
March 4, 2009, 08:07 AM
http://i48.photobucket.com/albums/f205/GaryXD/DCP_2164.jpg

http://i48.photobucket.com/albums/f205/GaryXD/dcp_2301.jpg

A standard bayonet will fit fine on 14.5" carbine (upper pic) or a 16" mid-length (lower pic)

jdh
March 4, 2009, 08:22 AM
It is on there because the front sight base is a common part, the lug is made into the FSB, to machine it off would add another step to building the gun and increase the cost of the labor to build the rifle. Or to have two different parts increases the cost by making the logistics train more complex.

Bill2e
March 4, 2009, 10:18 AM
A standard bayonet will fit fine on 14.5" carbine (upper pic) or a 16" mid-length (lower pic)

Interesting, what designation Bayo it that? The one I have, the ring rest on the barrel itself (m-7).

Coronach
March 4, 2009, 10:29 AM
Correct. The bayo will fit on a 16" midlength, or a 14.5" with a permanent FH. It will not fit on a 16" with a standard FH and CAR-length gas.

I put bayo lugs into the "nice to have, but hardly necessary" category.

Mike

ArmedBear
March 4, 2009, 10:34 AM
Bill2e, you probably have it on a 16" upper with carbine handguards.

That's what he was saying: it fits on a 14.5" barrel with carbine handguards, or a 16" with midlength handguards.

Anyway, the bayonet lug can be used as an anchor point for rails and other accessories.

http://www.botachtactical.com/fabbalugdumo.html

Gary G23
March 4, 2009, 10:36 AM
Bill2e,
This is the upper one:
http://www.1sks.com/store/ontario-m10-us-army-bayonet.html
This is the lower one:
http://www.888knivesrus.com/product/ON6504/ONTARIO_KNIFE_6504_C3S_MARINE_BAYONET_FIXED_BLADE.html

ETA:
As far as the attachment points are concerned, these are dimensionally the same as the M7 and M9.

Bill2e
March 4, 2009, 11:20 AM
Bill2e, you probably have it on a 16" upper with carbine handguards.

you are correct. M&P 15. I wounder why they did not put midlength hand gaurds on it.

Acera
March 4, 2009, 11:35 AM
I thought I would include this picture to better explain the issue the op discusses, with one of the more popular M-4 clones that are on the market. This one is mfg. by DPMS, the bayonet, however, is not a clone. The barrel is 16+ inches. As you can see, the bayonet is about 1 1/2 - 3 inches too far back from where it is intended to be. While the barrel does have enough meat to support it, it wobbles a lot in this configuration. As far as functioning, I expect it would perform somewhat satisfactory, thought limited by the reduction in blade exposure. Heck the thing is for looks, and I hope to never be close enough to have to use it as it was designed.




http://i494.photobucket.com/albums/rr301/300Acera/P3040003.jpg?t=1236184030

ArmedBear
March 4, 2009, 11:57 AM
BTW I think someone makes a barrel-mounted lug you can add to a 16", forward of the FSB.

Can't remember where I saw it, though.

I got a bayonet for my 20". That lug looked kinda lonely out there near the muzzle.

Besides, when it jams, I could possibly use the bayonet to help fight my way back to my more-reliable Mini-14.:D

Duke of Doubt
March 4, 2009, 12:00 PM
Schutzen: "Other than that, they are somewhat archaic."

Only because the guns have gotten so ludicrously short.

A squad of riflemen carrying full length Mausers, Mosin-Nagants, Enfields, Springfields, etc. with bayonets fixed and advancing through brush toward me wouldn't seem so "archaic" at all.

CoRoMo
March 4, 2009, 12:12 PM
If your opponent decides to grab your barrel and rip it from your hands, a sharp pointy knife could change his plans quick.

X-Rap
March 4, 2009, 12:22 PM
I think the trend toward shorter rifles is dictated by the modern battlefield.
Some of those mud forts and compounds they are expected to fight in plus the vehicles they travel in don't lend themselves to the long battle rifle. Somehow a half dozen high speed guys going through a 2' doorway with 03 Springfields and 16" bayonets does seem a little archaic.

Duke of Doubt
March 4, 2009, 12:56 PM
Good point. Back in the day of the full battle rifle, they wouldn't have entered the house. They'd blow it up with a French 75, a grenade, a DC or a bazooka.

woodybrighton
March 4, 2009, 01:28 PM
brits still use bayonets on bull pups.
does'nt come with a manual though fix on end of rifle stick repeatidly in enemies of the queen if there too slow or stupid to run away :D

rcmodel
March 4, 2009, 01:37 PM
That is the exact & only reason the real M-4 barrel is 14.4" long.
The rifle was designed around the bayonet, not the other way around.

I made a Weaver base light mount for my old Colt carbine bayonet lug because it wasn't good for anything else.


http://i81.photobucket.com/albums/j219/rcmodel/KTOG/CAR3.jpg

rc

az_imuth
March 4, 2009, 02:06 PM
One of the reasons I opted for a 16" barrel with a mid-length gas system. I didn't want a bayonet lug that wouldn't do what it was designed for. Now I just need one of those fancy M9 bayonets to install.
http://www.charleyssurplus.com/M9%20MULTI%20USE%20BAYONET%20TOOL%20OD%20GREEN.JPG

rcmodel
March 4, 2009, 02:12 PM
I don't know what that is, but it's not an M-9 bayonet.

http://en.wikipedia.org/wiki/M9_bayonet

http://www.olive-drab.com/od_edged_weapons_bayonet_m9.php

rc

Duke of Doubt
March 4, 2009, 02:17 PM
Yeah; I know my bayonets pretty well, and I've not seen that one before. Looks nothing like my M9.

Acera
March 4, 2009, 09:08 PM
That knife's sheath appears different, and it does not have the fuller. But other than that, what makes you all think it is not real? Color? But the Wiki article did say there were a lot of knockoffs and fakes.

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