C8 HBFT GL Sleeve dimension

greentips

greentips

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Does anyone know the dimension of the sleeve - I wonder if someone can make a detachable sleeve held on to the barrel by roll pin?

PS: there isn't really any purpose of it - but just a thought for those who have been looking to build a clone.
 
GT,

I’ve been thinking about your GL sleeve idea, and thought that instead of securing the sleeve with a roll pin, it could be manufactured to be secured by the flash hider. This would allow installation and removal without drilling holes and marking up the barrel.

IMG_0003-1.jpg


The above hasty pic of a sleeve illustrates what I mean. The sleeve slips over the barrel, and is held on by the FH. The FH would have to be timed, accomplished with either a crush washer, or by shims placed inside the sleeve.

I’m not sure if there are enough threads to accommodate the sleeve, a washer or shims, and the FH. Someone with current manufacturing experience will have to play with the numbers to check on that.

Another idea would be to make a sleeve and FH as one unit, and time it with shims.

Maybe one of the CNC guys who were looking for ideas can have a look to see if any of this would fly.
 
Armedsask said:
What is the purpose of this sleeve?
Click to expand...

Its the barrel profile of the C8A2, or the C8FTHB, or the C8SFW. It goes by different names in different circles.

Required to mount the M203A1 with the Canadian style mount.

The concept of the sleeve would be for those who dont have access to the Diemaco/Colt Canada-made barrels outside of work (most of us I would venture...;) ) who are interested in making a clone for themselves.

A pic to illustrate: (not a perfect example. The photo lacks the Ambi selector and charging handle. Also, not all C8A2's come with EOtech's
101-rifle-c8fthb-carbine-6.jpg


For a little more info:

See M203 about the funky Canadian mount: http://www.casr.ca/101-army-m203-grenade.htm

See C8FTHB: http://www.casr.ca/101-army-smallarm-1.htm
 
The sleeve, if my understanding is correct, is there because the M203A1 mount is designed for the C7. the front mount hooks on the barrel just behind the gas bloc, and the barrel is slightly thicker behind the gas block than in front of it.

So instead of changing the mount ( to ensure that the GL can go on both rifle and carbine), they press a sleeve on the carbine barrel. Obviously, you cannot install the gas block if the barrel is thicker at the front end.....but if you make a thicker barrel, than you have to use a non-standard gas block, but now you have to make the barrel even thicker behind the gas block....blah, just press a sleeve on the barrel.
 
Ok, that's what I thought it was for.

If someone can give me some dimensions I could whip one up once harvest is done. Is this going to be cosmetic only? Would aluminum work for weight reduction?
 
greentips said:
they press a sleeve on the carbine barrel. Obviously, you cannot install the gas block if the barrel is thicker at the front end.....but if you make a thicker barrel, than you have to use a non-standard gas block, but now you have to make the barrel even thicker behind the gas block....blah, just press a sleeve on the barrel.
Click to expand...

I could be wrong... but I've fondled a few FTHB's, and I'm pretty sure that it is not a sleeve, but rather the barrel's profile. (I'll call one of the wpn techs tomorrow and find out.)

However, by that logic, it does begs the question of how they got the gas block on there....

(Maybe cold fusion)?? thats not what i was thinking.... fail. Heating the gas block and cooling the barrel. :D lol

MTF
 
KevinB should put his 2 cents in here soon. It is called the simon sleeve and it is supposed to be for mounting a Bayonet IIRC.
R711 OUT
 
It's a sleeve that's heated and placed over a cold barrel. As already mentioned, it's designed to provide a correct diameter for the M203A1 to mount.
 
Allows to mount M203A1 and it allows to mount the bayonet with the 15.8 or 16.1 inch barrel. The orginal C8 14.5 inch pencil barrel is too thin to mount the 203 since it was designed for the C7 heavy profile barrel.

As for nomenclature the Simon sleeve first appeared on the C8FTHB which is a standard C8 with a new Flat Top reciever and the Heavy Barrel + sleeve.

C8FTHB Colt Canada also calls this model the C8SFW (Special Forces Weapon) for marketing but these are new manufacture weapons whereas the C8FTHB's that the CF use are refurbs.

C8FTHBA3 Carbine version of the C7A2. Green furniture, ambi latch, ambi safety, flat top receiver, and of course the 16.1 inch heavy barrel with Simon sleeve.

None of these are to be mistaken with the C8A2. The C8A2 uses the standard 14.5 inch pencil barrel with a flat top reciever. I have never seen any of these in use with the CF; the only 14.5 carbines I've seen are the standard C8's with the fixed carry handle. Perhaps someone can enlighten me on this because I doubt the CF actually use these.
 
yohann160 said:
Perhaps someone can enlighten me on this because I doubt the CF actually use these.
Click to expand...


Yeah, the CF used them (the C8A1). (Some units likely still have some kicking around)

When I was on roto 5 (TF 1-08), I saw two of them over there. So for the most part they appear to have been phased out.

Pics cross posted from Army.ca

C8toSFW.jpg


index.php
 
yohann160 said:
None of these are to be mistaken with the C8A2. The C8A2 uses the standard 14.5 inch pencil barrel with a flat top reciever. I have never seen any of these in use with the CF; the only 14.5 carbines I've seen are the standard C8's with the fixed carry handle. Perhaps someone can enlighten me on this because I doubt the CF actually use these.
Click to expand...

C8A2 is heavy barrel only. This is the Dutch bbl and is used for LE.
CF has no C8A2.
http://www.coltcanada.com/c8-page.htmhttp://www.coltcanada.com/c8-page.htm
 
C77 said:
C8A2 is heavy barrel only. This is the Dutch bbl and is used for LE.
CF has no C8A2.
http://www.coltcanada.com/c8-page.htmhttp://www.coltcanada.com/c8-page.htm
Click to expand...

Your link is broken.

C8 - Pencil bbl, carrying handle. 14.5"
C8A1 - Pencil bbl with flat top. 14.5"
C8A2 - FTHB (with the "sleeve") with Black furniture. (no ambi) ~16"
C8A3 - FTHB (with the "sleeve") with Green furniture and ambi selector, ambi charging handle and ambi mag release. ~16"

As mentionned previously, the C8A3 is the loose equivalent to the C7A2 in a carbine
 
yohann160 said:
... uses the standard 14.5 inch pencil barrel with a flat top reciever. I have never seen any of these in use with the CF; the only 14.5 carbines I've seen are the standard C8's with the fixed carry handle. Perhaps someone can enlighten me on this because I doubt the CF actually use these.
Click to expand...

They were in use in 2003. We received two C8A1's with EoTech's per infantry section during roto 0 in Kabul. Are they still in use? I'll let you know in the spring when I go back. I'd personally prefer one of them or even a carry handle C8 over the C8FTHB.
 
I noticed they were issuing all the 14.5's to drivers this January in Texas for the Vandoos currently there. Infanteer officers and NCO's had A3's, and a lot of troops in infanteer sections had A3s also, especially the M203s. The medics and the MP's all had C7A2s.
 
I had posted the dimensions on here and Army.ca in '04 I beleive.

IMHO its a worthless idea.

Bayonet is 1.5" shorter than a 'Armalite' midlength 16"
Grenade Laucher can be free float easily in rails that where available when this gun was concieved.
 
KevinB said:
I had posted the dimensions on here and Army.ca in '04 I beleive.

IMHO its a worthless idea.

Bayonet is 1.5" shorter than a 'Armalite' midlength 16"
Grenade Laucher can be free float easily in rails that where available when this gun was concieved.
Click to expand...

My sentiments exactly. Your thoughts are probably universal in this case. What peeves me is the huge chunk of metal between the C7/C8 barrel and the actual 203. It must weigh 2 pounds more than the American 203... not to mention how huge it is.

101-army-m203-grenade-6.jpg
coltm4-m203-nsn-a.jpg


Can you explain this?
 
Something to do with that Diemaco did some testing, and figured that after so many rounds through the rifle heat generated from the barrel may cook off the bomb. I heard/read that awhile ago so I could not quite remember the source.

You know - improvement!!
 
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