Colt Canada: Requirement-Driven Rifles

“Requirements”: A military development and procurement term that has leaked out a little into the civilian sphere. Requirements are only as good as the people that make them; sometimes requirements can get out of control, and sometimes they can result in innovative products that have everything you need and nothing you don’t.

It’s with this in mind that we take a look at Colt Canada’s 2015 products. Colt Canada – formerly Diemaco – produces their own AR-15 pattern weapons for Canadian military, law enforcement, and export customers. Due to its close relationship with the Canadian government, Colt Canada is often tasked with finding solutions to somewhat unique problems. One such solution is the IUR-16, a variant of the C8 carbine. This rifle has a totally monolithic handguard: Unlike it’s Colt counterpart, its receiver and quad rail are left as a single forging, with a prominent protuberance at the rear of the 6 o’clock rail:


What problem does this solve? It acts as a recoil surface for Colt Canada’s 40mm grenade launcher:


Due to the single-piece forging, the upper takes the entire recoil force of firing a 40mm grenade, instead of a lower rail attachment which might weaken. To compensate for this recoil surface (which the Colt Canada representative noted has a tendency to burn the hands after sustained fire), Colt Canada also developed a unique rubber rail cover:


On many of their rifles was also a new flash hider, with some interesting details:


The top of the flash hider is left unported, to help preserve visibility through night vision devices. The flash suppressor also has ridges running along its length, which were designed to help alleviate the sticking tendency of silencers and other muzzle attachments.

Nathaniel F

Nathaniel is a history enthusiast and firearms hobbyist whose primary interest lies in military small arms technological developments beginning with the smokeless powder era. In addition to contributing to The Firearm Blog, he runs 196,800 Revolutions Per Minute, a blog devoted to modern small arms design and theory. He is also the author of the original web serial Heartblood, which is being updated and edited regularly. He can be reached via email at


  • ATman

    Yay for Canadian Company’s now if only we could afford and hunt with those things.

    • Michael Guerin

      Free floating barrels are no good for bayonet fighting!

      • Yellow Devil

        You plan on bayoneting a moose?

        • Michael Guerin

          No, nor would I plan to shoot one using a chambering (5.56×45) that is best suited for shooting people, goats and very small deer (at less than 80m for the last two).

        • Gregory Allard

          “hunting with an AR15 is compleatly unsporting” “hunting with the most Poorly designed Spear ever issued (The M16 family is a great rifle by a really lousy hunting spear) Is compleatly evil and unsporting”

          but The AR15 is a wonderful rifle and If your a responsible hunter its a 1 shot DRT Meat gathering tool.

          then again i know idiot extreamist Fudds who need 4 300 Win mag rounds at 20 yards to put a doe on the ground… where as guys have Used a1/2 box of 7.62 shells to fill every Large game tag they had for ontario

          • The Brigadier

            Thank you Greg. The military is looking at the DPM’s AR-10 that shoots .308 Nato. Now that is a decent rifle. The same can be said for the SPC .268. Both highly accurate and are also suitable for hunting medium game as well.

          • Gregory Allard

            That said the .223 is not really a slouch In areas with 80 grain pills its not Unethical Provided you place the shot right as a dear round.

            then again it comes down to Knowing and your Limitations I know guys who can 1 shot a buck with a .22Mag.

            The S&W models are good if the whole Giving in to Clinton era blackmail terror tactics doesn’t bother you.

        • The Brigadier

          You planning on shooting a moose with a mouse rifle? I hope you can run very, very fast.

  • Esh325

    What I don’t get is why do manufacturers still make AR15’s,M4’s, and M16’s with front sight posts and non free floating barrels? It’s like putting a fixed A2 carry handle on the rifle.

    • FightFireJay

      Because most shooters (civilian and military) don’t need the slight accuracy increase of a more expensive free float tube. And the standard front sight block remains because it is the cheapest and most durable.

      Timmy Tactical shooting steel case ammo with a $27.95 red dot sight from Wal-Mart won’t need a free float tube or a tiny gas block. He does need it to be cheap!

      • Esh325

        My understanding is that free float barrels were developed with the military in mind in that attachments on the hand guard and the sling could potentially shift the point of impact on a non free floated barrel. And we actually a lot of military rifles coming with free float barrels out of the box. The HK416,Tavor, and G36 come to mind. But yes, you’re right that it is more expensive.

        • Gregory Allard

          More so it prevents harmonics affecting accuracy the bolt gun market has been doing it for years.

          Though a rifle with piles of crap mounted to it won’t care if the barrels free floated or not if the User is a noob.

      • The Brigadier

        God help us all if fighting does come to our streets.

    • Guest

      Maybe some of us like the classic look and aren’t really into optics but whatever

    • Vitsaus

      Three reasons: 1. Nostalgia from old guys that carried plain Jane ARs in the service. 2. Hollywood (up until recently) 3. Cheaper, which always sells.

    • The Brigadier

      Its the reverse form of perfuming the pig. The correct question is why do manufacturers still make AR15’s, M4’s and M16’s at all? There are only so many mice and rabbits to shoot after all.

    • Gregory Allard

      Cause for the most part Most people are not a good enough marksmen to NEED a free floated Barrel and even then the actual Improvemnts from free floating the barrel are worthless if the shooter is only shoting out to maybe 25/50 yards.

      sure if your shooting precission NRA or DCRA matches? or service rifle?

      but The average Guy or girl picking up an AR15 does not need it and wouldn’t notice the Differance.

      Ammo and lots of practice would benefit the average shooter MORE then a Free Float barrel

  • Paladin

    Colt Canada is actually now producing semi-auto variants of the C7/8 for domestic sale, TFB writers shouyld know this already, you guys featured an article on it when it happened.

    • I do know this. I was talking about their military products.

  • Mouldy Squid

    I’ve got one of their Diemaco civilian version ARs on order. Really looking forward to it.

    • Mazryonh

      What features are you looking forward to on that model that the American-made AR models don’t have?

  • Darin Henningsgard

    Anyone know what Optic is on the SA20 in the Pic?

    • Gregory Allard

      A leupold scope of some kind

      • Darin Henningsgard

        The SA20 is the 2nd one from the top it has a fancy Colt mount but i don’t think its a Leupold.

        • Gregory Allard

          Looks like one to me

  • Scott P

    I am not much of an AR guy but it would be cool if they imported these into the U.S.

    Yes I know the AR market here has everything one can need for it but for a collector who just wants a Canadian gun it would be awesome.

  • GunFarce

    A semi version of this rifle is still ‘restricted’ in Canada because it’s shape scares Liberals, and of course, it’s black.. Many others are virtually the same, but they were not in the issue of ‘Gun Digest’ that the liberals used to circle the ones they considered too scary for civilians to own. So, all the others can be used for hunting or just target practice on the farm. Guns, other than fully automatics, are restricted or prohibited in Canada based on how they are manufactured to look, and not how they actually function. A mini 14 dressed up to look like a AR15 is a non restricted firearm and can be used for hunting, but the AR15 is restricted and can only be fired on a registered range. As D.A.T. used to say, “it doesn’t have to make sense, it’s government policy”.