Colt Canada builds for the SAS

Big Bad

Big Bad

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Colt Canada lists these features for the C8s they sell to our friends in the Special Air Service, not being an AR gunsmith I find some of them hard to evaluate, I mean in the first section, re the bolt carrier channel, the screw retention deal, and the straight gas tube. Any comments?

There's a bad apostrophe in there, it bothers me but I'm not going to touch it.


Colt Canada British Special Air Services (SAS) 3rd Gen Integrated Upper Receiver’s

DESCRIPTION:

GEN 3 (current PRODUCTION Military) Integrated Upper Receiver (IUR):

Made for the UK Special Forces (SAS/SBS, etc.)

Interchangeable fit on all Mil-Spec “push pin" lowers;

Fully floating barrel system;

Dry film lubricated bolt carrier channel;

Screw retained (easily maintained) low profile gas block (under the handguard for safety);
Mil-Spec hard anodized black;

IUR is marked COLT CANADA 2C085 and NATO on the rail;

Straight gas tube to increase life and ease of installation.

BARREL:
Iconic “Colt Canada” cold hammer forged in your choice of 10.5” or 15.7” fully chrome lined barrel;
Canadian Forces Spec thicker chrome;
Phosphated to Mil-Spec;
Improved integral forged carbine chamber;
Colt Canada hammer forged choke bore;
1/7” twist RH/ 6 groove NATO approved bore;
Batch marked barrel and barrel extension;
High pressure tested HPT and magnetic particle inspection MPI as per Canadian Mil-Spec;
Anti corrosion coating applied under the handguards;
New liner to improve thermal protection of hands.

FLASH HIDER:
Standard C7/C7A1/C8/C8A2 type half birdcage for compensation and flash reduction.

RAILS:
Full top and bottom rails (10.5” 37 top and 19 bottom, 15.7” 46 top and 28 bottom);
Reinforced grenade launcher recoil lug;
The side rails are partially railed with 10 slot front accessory mounting point and slotted sling fitting on each side
Rail slots are numbered with laser engraving;
The rails are NATO STANAG 4694 spec and are back compatible with MIL-STD-1913 accessories;
Protected low profile gas block;
IUR has a hardened steel insert for the cocking handle latch to resist wear with enlarged tactical latches

BOLT CARRIER ASSEMBLY:
Full Canadian Forces specification (Military configuration) bolt carrier assembly;
Proof tested, MPI inspected, and lot number controlled bolt;
CF spec high retention staking of the carrier key;
Chrome lined carrier and key for wear resistance;
Chromed firing pin.

COLT CANADA CHARGING HANDLE:
7075 forged charging handle, machined and inspected to DND specifications.
Heat treated and phosphated extended “tactical” latch for ambidextrous operation.
Particularly advised if mounting an optical sight as it can be operated one handed from either side.
Latch is permanently retained by a double staked solid pin

BARREL LENGTH:

10.5” Integrated Upper Receiver (INCLUDES BCA+CH)
15.7” Integrated Upper Receiver ( INCLUDES BCA+CH)
 
Dry film lube sprayed in the upper receiver where the BCG reciprocates.
Gas block has set screws to mount it to the barrel. ( good ones I may add, they are larger than commercial gas block screws.)
Straight gas tube lessens the wear versus the standard dog leg shaped standard gas tubes.

These are well made, well designed, a little heavy- but made for battle uppers.
** note the close quarters battle upper is 10" not 10.5 ( I wish they would correct that)
 
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Maybe this is added on in the UK, but I don't think they use the standard birdcage.
 
vickers vanguard said:
Mister Donut....I guess you have one in your collection ( CC 10 in SAS IUR). If that’s the case, how would you rate it in general ?
Click to expand...

I own 2 SAS uppers. If I had to choose only one AR15 to keep or take with me it would be the 10" SAS CQBR weapon.
Incredibly durable barrel.
Excellent accuracy.
Extremely well built receiver.
Will shoot a variety of commercial and military ammunition. (generous gas port size)
 
Also known as a squeeze bore,the bore tapers very slightly at the muzzle, it's not a by-product - if it were haphazard it could be dangerous, it's done very deliberately. Not a feature of many (any?) other AR barrels - CHF or other. It's one of the things that makes these barrels as good as they are - that and the chamber and bore being forged on the same mandrel.
 
RifleDude said:
Does anyone know what a choke bore is? I normally associate "choke" with shotguns.
Click to expand...

It basically squeezes the bullet out of the barrel. It's sometimes referred as a Canadian chamber. Slight taper towards the muzzle. It produces better accuracy.
 
enefgee said:
Also known as a squeeze bore,the bore tapers very slightly at the muzzle, it's not a by-product - if it were haphazard it could be dangerous, it's done very deliberately.
Click to expand...

It is not done deliberately. It is a by product of the rotary forging process, straight out from engineering talking paper free of marketing quips. Unfortunately it is hard to google for any of these things now because the inter web is full of marketing quips. it becomes more difficult to find anything technical on barrel hammer forging.

In fact, I think it was probably HK USA Jim Schulz(?) the very first one to market it as a "feature". I heard about this thing back in the days of small arms review first started. It is almost the same story as the creation of vegemite.
,
Rebel Rouser said:
It basically squeezes the bullet out of the barrel. It's sometimes referred as a Canadian chamber. Slight taper towards the muzzle. It produces better accuracy.
Click to expand...

That is the muzzle, not the chamber. The Canadian or the dutch chamber was actually something about the shoulder angle in the chamber - someone explained to me but I forget the detail.
 
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