Canadian Made, 5R Guardian and Match Series barrels available now

Maple Ridge Armourer said:
The chambers will be SAAMI 308 Win. MinOAL is 2.490 and MaxOAL is 2.810 where the M118LR is OAL 2.83. Looks like the M118LR may not fit.

Of course the OAL for an AR-10 magazine is only 2.80 so you may have difficulty putting an M118LR cartridge in an Ar-10 magazine.

We will look into 20" barrels. Not a bad idea to offer choices.
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The most common AR308 mag right now is the Pmag which allows 2.830. They are designed for M118LR. KAC mags also allow for the longer OAL. The M118LR round is the 175 smk bullet.

Those of us who want the 1:11.25 twist in a 20" are likely to be shooting the 167-178 rounds. Although I have found 155 has shot surprisingly well.

As long as the 308 match chamber works well then no worries. But.. I still think the right barrel length and twist rate are the most important factors. I just know that a lot of people will shoot pretty much anything out of these rifles and a chamber that doesn't detract from accuracy while also providing excellent reliability is a good thing.

It's hard finding the specs for who uses which chambers. But I think you would find that most of the well known combat proven accuracy 308 rifles are using some sort of modified chamber rather than a 308 match. Of course they also have the advantage of knowing the exact ammo that will be used. Most of the better known barrel companies for AR308 rifles also seem to be using some sort of M118LR style of chamber. The bottom line is reliability and accuracy.

I have already ordered my Stag 10 barrel after previously emailing you guys regarding those specs and at the time there wasn't enough interest. However if these barrels show themselves to be what I was looking for, then I will likely end up buying one for my BCL 102. I look forward to seeing these barrels on people's rifles!! I've heard good things from people who know you guys!!
 
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Epoxy7 said:
The most common AR308 mag right now is the Pmag which allows 2.830. They are designed for M118LR. KAC mags also allow for the longer OAL. The M118LR round is the 175 smk bullet.

Those of us who want the 1:11.25 twist in a 20" are likely to be shooting the 167-178 rounds. Although I have found 155 has shot surprisingly well.

As long as the 308 match chamber works well then no worries. But.. I still think the right barrel length and twist rate are the most important factors. I just know that a lot of people will shoot pretty much anything out of these rifles and a chamber that doesn't detract from accuracy while also providing excellent accuracy is a good thing.

It's hard finding the specs for who uses which chambers. But I think you would find that most of the well known combat proven accuracy 308 rifles are using some sort of modified chamber rather than a 308 match. Of course they also have the advantage of knowing the exact ammo that will be used. Most of the better known barrel companies for AR308 rifles also seem to be using some sort of M118LR style of chamber. The bottom line is reliability and accuracy.

I have already ordered my Stag 10 barrel after previously emailing you guys regarding those specs and at the time there wasn't enough interest. However if these barrels show themselves to be what I was looking for, then I will likely end up buying one for my BCL 102. I look forward to seeing these barrels on people's rifles!! I've heard good things from people who know you guys!!
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OK cool. We will look into chambering to accommodate the M118LR. Thanks for the input.
 
Maple Ridge Armourer said:
OK cool. We will look into chambering to accommodate the M118LR. Thanks for the input.
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Sounds good. Just to clarify...

The so called M118LR chamber I'm referring to is the .308/7.62x51 version of the .223 Wylde design.

A typical AR-10 or other .308 AR pattern rifle will normally come standard with a SAAMI specified .308 Win chamber. While this configuration is designed to accommodate a wide range of different ammunition options effectively, it is less than ideal for a precision .308 AR rifle build. A wider throat diameter (.310) and shorter freebore length (.090) will allow the rifle to accommodate chamber pressures typically found with factory loads, but the wider inside diameter of the throat can cause complications with bullet and bore alignment during feeding, limiting accuracy potential with high performance ammunition.

.308 Win M118 Tactical (308 M118 LR) chamber as a basis for their reamer design. This configuration offers a slightly thinner throat (.3085 diameter) with a longer .117 freebore to effectively regulate chamber pressure and account for variance in bullet design. While this chamber design can safely and reliably function with any number of standard factory ammunition options, by slightly modifying the traditional throat dimensions this chamber can very effectively accommodate the ogive of the Sierra 168 HPBT #2200 and 175 gr. HPBT #2275 MatchKing bullets loaded near or at magazine length.

By tailoring their chamber to optimally function with some of the most prevalent match bullets on the market, is able to offer a .308 AR barrel design that offers consistent sub-MOA performance.
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Leonidas said:
Might have trouble at that price point. For the same $ you can import big name match barrels from the US.
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I've only found one with those specs and it will be around $500 to bring it in. But.. that's with current exchange rate along with the current climate for importing. As we all know that can change very quickly. I'm also looking at September before I can receive that barrel. I consider their price point to be fair. It's less than importing the barrel and looks to offer all the features. It's also good to have a domestic source rather than rely on importing which can be a pain.
 
Here is a cut away image of a 223 Wylde chamber and bore on our 5R series of barrels. This was just a scrap end cut we thought we would chamber to show you all what you can expect from a Maple Ridge Armoury 5R barrel.

Despite the lighting, the chamber is extremely smooth to touch, there are no machining marks. The bore as you can see has been hand lapped thus producing a perfectly smooth finish.

Chamber cutaway.jpg
 

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