Coup De Grâce, New Action from American Rifle Company, $899 WOW!

Not a lot of defiance experience. Best I can say on bolt close is very similar to Gen 2 Nuke, almost closes itself. Noticeably lighter close than my 2 origins.
This is likely my favorite aspect of my ARC actions...the way they close on a round is beyond amazing. Maybe it's the toroidal bolt head? I don't know, but I love it.
 
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With the adjustable trigger hanger you will be able easily and precisely tune this action to have zero cock on close. This will give you a super smooth bolt close. This was a point of emphasis with the design of this action. Through our experience with our other actions we found that the variations in sear position of trigger manufacture designs made it nearly impossible have a one size fits all cocking piece. Like all manufactured parts there is acceptable tolerances that are held, but when you have so many components combined in an assembly you have a stack up of these deviations and if they all go in the wrong direction that is when things can go awry. Now toss in multiple manufactures and you can see how this becomes challenging. This designs solves that problem with a turn of a screw you can have the perfectly timed action, zero cock on close and nearly zero reduction in pin fall. I am confident if you give this action a try you will be very happy with the bolt cycle.
That’s what I was hoping for, thank you for the response.
 
@karagias @Jon_ARC


Have you considered short/rounded flutes like on an AI bolt? Would that decrease the issues when someone doesn’t run the bolt correctly?

Let’s be honest, looks is a big part of it for some consumers (and obviously flutes are functional as well).

I handled the action at the Vudoo booth and it’s a home run.

But, I would definitely like to see a fluted bolt.
 
The archmedes can get away with a lighter bolt lift with a stiffer spring due to the way the primary extraction is happening. My Nuke 2.0 is 19lbs (default is 25lbs) and I think the Arch is 30lbs I believe and Arch has a slightly lighter bolt lift. I would believe the CDG would be similar idea.
 
CDG will always be Charles de Gaul for many of us... and that acronym shall never pass my lips in reference to anything else. ;-)

Also, if you think "coo-d-gra" is too long of a name, but have no problem with "ar-che-mee-dees" you're probably the same jack ass using "lima charlie" instead of "loud and clear" on the net because you think it makes you sound bad ass ;-).

Very little of what you said makes any sense to me. My Internet presence is very limited. I also never said anything about the length of the name, just that I didn’t like it. Reading comprehension isn’t very common around here.
 
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What weight is the firing pin spring that will come with it? Will lighter/heavier options be available?
We want to do more testing before we settle on a spring weight. We will have multiple available from light to heavy. Initial testing has shown we should be able to use a lighter spring than our other actions which makes this action feel really good. You are going to love the light bolt lift.
 
I would love to see the deep flutes like in the rendering simply because it looks awesome. That being said, like others have already mentioned, I would still buy one if it's deemed to run better without them as this action ticks every box I've been looking for in an action for years. As soon as I can get one in Canada I'll be buying a long action for a build.
 
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Very little of what you said makes any sense to me. My Internet presence is very limited. I also never said anything about the length of the name, just that I didn’t like it. Reading comprehension isn’t very common around here.
It's not common anywhere ;-). Nor is good writing, as I failed to delineate that which was in response to you (intended to be good natured, by the way) and that which was in response to a sentiment expressed by several others.
 
Thread Timing

The Coup De Grâce will have a timed barrel thread. However, that does not mean that pre-fit barrels will time to within a degree or two. We cut a 1.0625-20 UN 2B female thread into the receivers. Accordingly we also specify a 1.0625-20 UN 2A male thread for the barrel. For those of you that are unfamiliar with thread specifications, the 2A and 2B denote the tolerance class of the thread, A for male and B for the female. Class 1 has the loosest tolerance, class 3 has the tightest, and class 2, you guessed it, is somewhere in between and is the most commonly used class in industrial and commercial applications.

The tolerance applies to the pitch diameter of each thread, which is the average of the major and minor diameters of the thread form when drawing with sharp roots and crests. Actual threads have truncated roots and crests for durability. For the specified barrel thread, the pitch diameters male and female threads can be as much as 0.0105 inches apart above the nominal clearance between the two. And since these are v-threads with a 60° included angle, the axial movement necessary to move the threads through the tolerance and into contact with one another is just the 0.0105" max tolerance x tangent of 30° = 0.006 inches. Given that there are 20 threads per inch, the barrel will move axially by 0.050" for every revolution, we can see now that an axial move of 0.006" requires .006/.050 = .12 revolutions = about 43 degrees. I'll bet that's more than most of you thought it would be. I know it surprised me the first time I looked into this.

So yes, we time the threads. But the thread mill used to cut the thread is constantly wearing out and therefore the pitch diameter of the thread within the receiver will be somewhere between the high and low limits of the tolerance which introduces considerable variability in the final position of the barrel's orientation with respect to the receiver. We try to hold the pitch diameter closer to the high limit simply because we want barrels to screw on every time, but we use most of the tolerance. Likewise, I think the barrel should be held closer to the low limit for the same reason. Clearance is good, especially in threads. There is no accuracy advantage to running tight threads. The 60° thread angle of both loose threads and tight threads both centralize the male within the female extremely well, and so long as the barrel is properly torqued, at least 100 lb-ft, the barrel will not move with respect to the receiver. I know, lots of people running lower torques, but I don't like do so.

I hope that helps.

Ted
f I could change the subject a little.
This new Coup action pretty much ticks all my boxes so, I'll be ordering when they become available.
I'm particularly interested in the AW mag compatibility & am wondering if you guys have designed the action to run AW mags with the Xylo chassis in mind. I'm particularly interested in running 6 BR with an AW short case mage kit. Would it be possible to test the Coup with that configuration?
Also, do you recommend the Xylo chassis for use with the AW mags in preference to say the new MDT ACC?
 
One more question, and this may sound silly, but is it only going to come with the red black color scheme or can you get it in straight black? or would that require changing bolt knobs? I get OCD with my builds and I'm a weirdo when it comes to matching colors :ROFLMAO:
 
f I could change the subject a little.
This new Coup action pretty much ticks all my boxes so, I'll be ordering when they become available.
I'm particularly interested in the AW mag compatibility & am wondering if you guys have designed the action to run AW mags with the Xylo chassis in mind. I'm particularly interested in running 6 BR with an AW short case mage kit. Would it be possible to test the Coup with that configuration?
Also, do you recommend the Xylo chassis for use with the AW mags in preference to say the new MDT ACC?
I will look into testing with a short mag kit. We have been using the AW mags with the Xylo chassis without any problem. I do not see why they would not work with most other chassis as well.
 
One more question, and this may sound silly, but is it only going to come with the red black color scheme or can you get it in straight black? or would that require changing bolt knobs? I get OCD with my builds and I'm a weirdo when it comes to matching colors :ROFLMAO:
No worries, we will have all black available as well.
 
Pic courtesy of LRO
FE36720F-522C-4870-A19C-F1C48D81582D.jpeg
 
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We want to do more testing before we settle on a spring weight. We will have multiple available from light to heavy. Initial testing has shown we should be able to use a lighter spring than our other actions which makes this action feel really good. You are going to love the light bolt lift.
Correct me if I’m wrong, but isn’t the spring in the pre-sale nucleus 1.0 16 pounds? That’s what I seem to remember from back then. Some people had issues with light primers strikes and you provided free 19# and then 21# springs upon request.

I kept the original, and with federal GMM primers have never had an issue so far.
 
Correct me if I’m wrong, but isn’t the spring in the pre-sale nucleus 1.0 16 pounds? That’s what I seem to remember from back then. Some people had issues with light primers strikes and you provided free 19# and then 21# springs upon request.

I kept the original, and with federal GMM primers have never had an issue so far.

Currently the Nuke and Mausingfield both ship with 25# springs and the Arch ships with a 30#. I have a Gen 1 Nuke that only had issues with the 16# using hard .223 primers but a 19# spring works fine with only a slight increase in bolt lift.

I switched my M7 to the 19# spring and I’ve only had one or two FTF both when it was very cold out so I primarily run the 25# since it works all the time. The 19# definitely feels significantly lighter though so I was using that while shooting during the summer.
 
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Correct me if I’m wrong, but isn’t the spring in the pre-sale nucleus 1.0 16 pounds? That’s what I seem to remember from back then. Some people had issues with light primers strikes and you provided free 19# and then 21# springs upon request.

I kept the original, and with federal GMM primers have never had an issue so far.
This is correct. This is why we need to test more. We have had very good success (100% in fact) with CCI 450's in a controlled environment. Over the next few weeks we will be taking the action putting it through more testing in real world conditions to make sure it work flawlessly.
 
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This is correct. This is why we need to test more. We have had very good success (100% in fact) with CCI 450's in a controlled environment. Over the next few weeks we will be taking the action putting it through more testing in real world conditions to make sure it work flawlessly.
If you need anyone to help test it—I’m only a short drive away.
 
@Jon_ARC Looking forward to seeing your updated fluting design, I think it’s a smart call to keep them but also make them functional. Please also keep the bolt knob, to me it just looks ideally functional, as was the Nuke Gen1 knob that shared some characteristics.
 
I will look into testing with a short mag kit. We have been using the AW mags with the Xylo chassis without any problem. I do not see why they would not work with most other chassis as well.
If you guys would test the Coup in this config, that would be excellent.
Even better if you could tweak it if necessary to run the BR cartridges.
I reckon ARC has hit a home run with this action.
Great stuff.
 
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There’s not much to test. If the aw mag sits up tight to the action, it will run.

If the mag catch isn’t adjustable on a chassis set up for aics mags, you’ll need a longer catch. Be that from the manufacturer or done aftermarket.

If an aw mag isn’t running in a chassis when it’s sitting up against the action, the mag itself is likely out of spec.

For some reason aw mags remain a mystery to the community when the operation is very simple.
 
We also need to remember, when we run non .308 type cases, we are running cartridges not designed to be run in magazines.

There are actions and magazines such as the border super 6 or mdt 6br mags.

Aw mag kits are just a bandaids on a mismatched design.

And it would be a fairly unfair ask for any chassis manufacturers to attempt to make their chassis work with things that are not designed for such.
 
We also need to remember, when we run non .308 type cases, we are running cartridges not designed to be run in magazines.

There are actions and magazines such as the border super 6 or mdt 6br mags.

Aw mag kits are just a bandaids on a mismatched design.

And it would be a fairly unfair ask for any chassis manufacturers to attempt to make their chassis work with things that are not designed for such.
Maybe so but, the action starts out with the most significant design attribute for AW feeding which is the six o'clock lug config.
It won't be the smoothest feeling action when chambering & ejecting but that's a small price to pay in my opinion.
I'm looking fwd to the speed & convenience of topping off the magazine in place through the action as well as the far less intrusive mag length.
How I use my rifles is very unusual in comparison to the way most shooters use their rifles & although the AICS mags I use perform extremely reliably, they simply aren't as flexible for my requirements.
Normally I wouldn't take the gamble with a 1st iteration of anything but, knowing how Ted does things, I'm willing to take that bet.
I've got a suspicion that Teds got his ducks in a row on this one so I'll go with him.
 
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