An AR15 build with a Canadian twist.

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Onmilo

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Well here it is,
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Colt Canada, formerly Diemaco Ltd.,http://www.coltcanada.com, produces some pretty tricky M16 rifles for the Canadian Government and for other countries that love the M16 and hate America.

This is my take on one of their offerings.

My version of the flat top C7A1 features the green furniture which came from Cav Arms, buttstock and handguards.
I figured that buying from them I could contribute a few bucks to their cause and dealings with the Feds.
I prefer the M4 style sliding stock to the older four position Colt stock so I went with it.
The buffer and spring are plain old standards, no H marked or subgun buffer, no heavy springs needed, these work and function just fine in a 20" barrel length application.
I added a CAA cheekpiece with battery storage and a rubber buttpad from SOG.
I do have a MagPul CTR slider stock in OD green but it is Mil-Spec diameter and I would have to replace the extension tube to get this one on there.
I may yet, I do like the MagPul stock.
The grip is a BufferTech which also has a storage compartment for batteries.
I keep some small parts, a pin punch and a spare firing pin in these storage spaces.

The lower is one of those dreadful DPMS offerings,

The upper is from Evolution Gun Works

The barrel is a 1-7 twist, 5.56 chambered, chrome lined Government profile Bushmaster, I mounted a Yankee Hill Phantom flash suppressor on this barrel instead of the regular A2 flash hider, good stuff.

I chose the EVG flat top upper because they machine them to the Weaver dimension instead of the American Mil-Spec M1913 'Picatinny' rail dimensions.
This is important because the Bushmaster does not come with a taller 'F' marked front sight housing and to get folding sights, dot optics on Mil-Spec mounting plates, and detachable carry handles to cowitness properly on Mil-Spec uppers requires a taller front sight, usually.
Besides rifles made for the Canadians come with a Weaver specification rail, not an American 1913 rail.

The bolt and carrier are from Smith Enterprise direct from back when they had the time to actually make this stuff.
It has all the modern bolt upgrades, black buffer, D-Fender D ring, chrome silicone springs, blah, blah.

Trigger group is plain old semi auto single stage, who knows where I got them, they were in the parts bin, the springs are Wolff though.

I added a Norgon ambidextrious magazine release and a Brownells ambi' receiver sling plate.
I didn't add the ambidextrious charging handle release and selector lever that the Canadians also offer as options.
I feel these items just put levers in place that get in the way more than they solve any perceived problems for shooting the rifle off the left side.

I took the bottom sling mount off the stock, don't need it and they just seem to get in the way for me.
Give me a single point sling any day, after using a couple I have learned to love this method of slinging a defensive type rifle.
I did mount a Colt barrel mount front sling swivel because a two point sling mounted at the back of the receiver and at the front sight housing is almost as good and almost offers enough sling play to be as good as a single point sling, almost.
Now the Canadians place a rail mount on the front sight housing called a Triad 1.
I do have some SOG rail mounts that are very similar but I haven't seen a good reason to put one on yet.
On a 20" rifle with full length forend, the rails are way too far forward to get a useful grip with a vertical forend.
I don't own a passive, night vision compatable laser and don't intend to laze any buildings for the Airforce to blow up.
I guess if I ever get inclined to jacklight a deer I might add the rail, for now this set up works

Oh yeah the magazine is a MagPul P Mag.
I don't own a Canadian Mil-Spec. Thermold magazine.
Besides, I don't want the rifle so close to the original that CC tries to hammer me for infringing on their good ideas, and they really are good ideas.

I am posting this as an option for some of you guys who might be contemplating a build and just don't fancy another take of the M4 carbine and still want something a little different. HTH
 
Alright, nobody asked, so I am going to spill the beans.
'Milo, what are the receiver height specifications so that I may know whether I need an 'F' marked tall front sight housing or tall carbine front sight post when matching my barrel to my flat top upper receiver.'

If you upper receiver has dimensional height of between 1.835" and 1.844" measured from the bottom flat of the upper receiver to the top flat of the rail, you will benefit from an 'F' marked front sight housing or tall carbine front sight post.

If your receiver has dimensional height of between 1.844" and 1.855" measured as above, you may use a standard front sight housing and standard front sight post, any and all, of your choosing.

Of the large number of Evolution Gun Works flat top upper receivers I have used on builds and also measured,,
each and every one has recorded a dimensional height between 1.845" and 1.852"

You can use a number of measuring devices to find the height of your receiver, I like a Starrett 6 inch english measure stainless steel caliper and check at least seven points along the length of the upper receiver.

There is another interesting footnote in the differences between the Canadian railed upper receiver and the American railed upper receiver.
The Canadians moved the rails back just a bit more than the American design and consequently were able to cut one additional rail slot in their receivers for a total of fourteen.
Unfortunately the EGW flat top upper receiver does not offer this feature and adheres to the American use of a lucky thirteen rail slots.
Something to ponder while deciding the perfect location on the rail for your reflex dot optic and mini night vision device,,,,,,,:)
 
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