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ARC Nucleus

Sounds good. I hesitated a long time between a tenacity, origin (or a used TL3) or the nuke2. I never owned a ARC action and I kinda like the idea but they did seem to have issues in the past. I just want a rifle that runs. Doesnt need to be super Uber smooth like a terminus or 737r.
Also the xylo is growing on me even though it looks - weird. Have a Foundation Centurion + Hawkins M5 so I might throw the xylo on the RimX since I really like mag latch that prevent the mag from moving upward when pressure is applied to it. I wish every single AICS DBM had a adjustable lever (like the MPA) with the ARC mag bump. It’s so silly that in 2021 we still have feeding issues with bolt guns.
 
st1650 said:
Sounds good. I hesitated a long time between a tenacity, origin (or a used TL3) or the nuke2. I never owned a ARC action and I kinda like the idea but they did seem to have issues in the past. I just want a rifle that runs. Doesnt need to be super Uber smooth like a terminus or 737r.
Also the xylo is growing on me even though it looks - weird. Have a Foundation Centurion + Hawkins M5 so I might throw the xylo on the RimX since I really like mag latch that prevent the mag from moving upward when pressure is applied to it. I wish every single AICS DBM had a adjustable lever (like the MPA) with the ARC mag bump. It’s so silly that in 2021 we still have feeding issues with bolt guns.
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Really looking hard at this action also. Came across the xylo package deal, that pretty much checks all the boxes.
 
Got mine for under 2k which is what it would have cost me to get a Havak Bravo, so obviously much better value. I can easily get my money back if I ever decide to sell the xylo chassis if I don't like it but it's growing on me quite a bit, especially with the option for a large grip and the extra length arca spigot. I also have a few Area419 clamps as well as the rail changer X plate - will make a nice tripod/barricade rifle

TL3 would have been sweet too but just too much coin for the extra mile.
 
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st1650 said:
Any particular technique ? Just throw the round on top of the empty mag and slam the bolt ?
My 1000 yards practice range has mandatory single feed and I really hate doing it on my DTA and was hoping it would do it fine in the Nuke.
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No issues in mine single feeding 6 Creed but .223 is a struggle owing to the smaller chamber and flat breech.
 
st1650 said:
Are the ARC mags the same height as the MDT DSSF or slightly shorter (ie in between AW and DSSF)
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They're a bit shorter than the MDT mags. I just received a couple ARC mags last night. I'll try to get some pictures/measurements for you if I can get some free time tonight or tomorrow.
 
Here's a picture showing the height difference:

20211028_181630.jpg
 
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st1650 said:
Does the sear needs to be timed with a trigger tech or are they pretty good out of the box ?
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I’ve built x8 Archimedes and Nucleus (some for customers some for myself) and they’ve all been good to go. I’ve used special and diamond single and two stage triggers.

Archimedes bolt lift is so dam good.
 
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rydah said:
I’ve built x8 Archimedes and Nucleus (some for customers some for myself) and they’ve all been good to go. I’ve used special and diamond single and two stage triggers.

Archimedes bolt lift is so dam good.
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Are you saying the archimedes bolt lift is lighter than the nucleus? If so by how much?
 
Big Timber said:
Are you saying the archimedes bolt lift is lighter than the nucleus? If so by how much?
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The only thing bolt lift needs to do is cock the firing pin, no primary extraction, so the helix angle can be much friendlier. I’m not sure it’s half as much effort, but it’s noticeable.
 
Big Timber said:
Are you saying the archimedes bolt lift is lighter than the nucleus? If so by how much?
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It’s a huge difference. In saying that though I’m not sure what spring weight the Archimedes ships with compared to the nucleus though (nucleus has 25lbs spring which is heavy) so not sure if it’s apples to apples comparison.
 
I still run the 16# spring in my Gen 1 Nucleus, and installed a 16# spring in my new Gen 2 Nucleus build. Both go bang every time you pull the trigger. The Gen 1 has a TT Diamond trigger, and the Gen 2 has a TT Special trigger. I've never had a single issue with light primer strikes.
 
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Txhillbilly said:
I still run the 16# spring in my Gen 1 Nucleus, and installed a 16# spring in my new Gen 2 Nucleus build. Both go bang every time you pull the trigger. The Gen 1 has a TT Diamond trigger, and the Gen 2 has a TT Special trigger. I've never had a single issue with light primer strikes.
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I ordered both the 16 and 19. Might run the 16 for the range and switch to the 19 for hunting season.
 
I’ve been so impressed by my 2.0 I’m considering getting a 1.1 (for the wife) if I don’t care about the keyed rail am I really missing out ?
 
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Well I bought a used Nuke 1.1 with a 26” 6.5 CM Krieger heavy MTU to celebrate Kyles verdict so I guess the wife will inherit the 2.0 with the medium Palma.
 
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I've had tons of light strikes with my Nuke, on the 16, and on the 18 or 19 I replaced it with. Most were military ammo with harder primers. No issue with FGMM, for example.
 
celltech said:
Love my 2 Nukes, run 16# springs on both of them....have never failed to go click/bang.
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I have 16 pounders in mine too. The original G1 I got had a lot of light strikes. I pulled the bolt apart and cleaned all the packing grease out of it and haven't had any issues since. It's got thousands of rounds through it. Picked up a G1.1 with the 25 pound spring and couldn't believe that ARC would sell something this hard. I ordered a 16 pounder and life was good again. Used that action all last year and never had an issue, worked flawlessly. I ran GMM-AR and CCI 450 primers all year.
 
epeet said:
I've had tons of light strikes with my Nuke, on the 16, and on the 18 or 19 I replaced it with. Most were military ammo with harder primers. No issue with FGMM, for example.
Click to expand...

That makes me think the round may be moving forward a bit due to head spacing. Are you talking American military ammo or Russian/Comm Bloc ammo? I used GMM-AR primers almost exclusively last year and had no issues at all.
 
epeet said:
I've had tons of light strikes with my Nuke, on the 16, and on the 18 or 19 I replaced it with. Most were military ammo with harder primers. No issue with FGMM, for example.
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Any lube/goop on the striker assembly?
 
Just ordered one the 2.0 back in late December. Can't wait for it come in. Ordered a LH LA for my 7SAUM build.

Doc
 
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I'll resurrect this thread. I'm not sure why there is so much love for the nucleus here. I had a ton of light primer strikes with my Gen 1 with the 16 lb spring that came with it. So I switched to a 19 lb spring. Last match, I had 3 light strikes out of about 80 rounds. Everyone said I didn't seat my primers enough. Funny because I've not had that issue with any other rifle I reload for, and after checking, all my primers were below flush, but either way its completely unsat. So I changed again to the 25 lb spring and it's got a comically heavy bolt lift now.

Not to mention my action has never controlled round fed. My origin is a true CRF, the nucleus is not. I've put both actions in the same chassis and used same mags, the ARC wouldn't CRF no matter what I did.
 
Confirm your firing pin protrusion, confirm your headspace, confirm you are not bumping the case shoulder excessively.

My gen one nuke will CRF with MDT mags provided you are quick with the bolt.
 
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tomcatfan said:
all my primers were below flush
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How far below flush? What is your firing pin protrusion? It is adjustable on the Nuke.
I've got about 800 rounds on my 1.1 with a 19# spring zero light strikes. Cant remember protrusion but I checked it before and after I changed to the 19# spring to ensure it was the same or +.001 - .002
Recently I've loaded with Russian Wolf magnum SRP & CCI #41, no issues & single digit SD's

Mine must be controlled round feeding. When running it slow on the bench, it's so damn smooth, I question if it actually picked up a round. Every time I fall for it and check, it has indeed chambered a round. I'm using ARC mags & they do have shorter feed lips that allow the round to pop up sooner.
 
Last edited:
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I have a Gen 1 and Gen 1.1, both with 16 pound springs and no issues. Now, I did have issues that turned out to be brass with too tight of primer pockets and I was crushing the primers. No light strikes though, the strikes were deep. The priming compound was crushed/crystallized causing the issue. Once this was figured out and primer pockets uniformed all was well.

If you are having light strikes I’d heed the others advice and check pin protrusion, shoulder bump and head space.
 
I'd agree with those saying to check your pin protrusion. I had thousands of handloads through my Gen 1.0 with 16lbs spring (all CCI 400s and BR2s) with zero lights strikes. I came into a real good deal (this was pre-covid) on Hornady Steel match in .223 and bought a bunch and started getting light strikes. Swapped in a 19lbs spring and never had an issue again and the rifle's total round count is somewhere close to 20k.
 
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Lube on the striker will slow it down. Just an FYI.
 
I have a 1.2 and 2.0 Nuke, both with 16lb springs and TT primary triggers. -0- issues with FTF, and they always control feed the rounds with both ARC and MDT mags. No hard primers here, just plain old CCI 200/400. And I do agree that with the 25lb spring the bolt lift is pure shit...
 
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I'm another 16lb spring user with 0 issues. I've used three different barrels on this action and two different bolt heads. All handloads using FGM SR primers or CCI SR. I love my Origins but the Nuke isn't going anywhere either.
 
357Max said:
How far below flush? What is your firing pin protrusion? It is adjustable on the Nuke.
I've got about 800 rounds on my 1.1 with a 19# spring zero light strikes. Cant remember protrusion but I checked it before and after I changed to the 19# spring to ensure it was the same or +.001 - .002
Recently I've loaded with Russian Wolf magnum SRP & CCI #41, no issues & single digit SD's

Mine must be controlled round feeding. When running it slow on the bench, it's so damn smooth, I question if it actually picked up a round. Every time I fall for it and check, it has indeed chambered a round. I'm using ARC mags & they do have shorter feed lips that allow the round to pop up sooner.
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I kept the pin protrusion the same as what came from ARC which was about 0.035".

When you are clambering a round, can you extract it without sending the bolt full forward or closing the bolt? I can't. The round pops up out of the mag and is not grabbed by the bolt face. Im using ARC mags as well. The origin that I just picked up, that does CRF.
 
tomcatfan said:
I kept the pin protrusion the same as what came from ARC which was about 0.035".

When you are clambering a round, can you extract it without sending the bolt full forward or closing the bolt? I can't. The round pops up out of the mag and is not grabbed by the bolt face. Im using ARC mags as well. The origin that I just picked up, that does CRF.
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I'll check it today & let you know.
 
If I had to guess, I’d say running the bolt too slow for the CRF achievement to be unlocked.
 
Might also be a mag height problem, if it's presenting the round too low then the feed lips might let it tip up and slip past the CRF rim on the bolt face. If so, that's more of a stock/chassis problem, although I can understand frustration about the ARC action requiring a more precise fit on that.

Just something else to check.
 
Tokay444 said:
If I had to guess, I’d say running the bolt too slow for the CRF achievement to be unlocked.
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Perhaps, but using the same exact technique I'm able to unlock that achievement with my m1903, m1903a3, and my origin.

This does seem to be a trend though, all of my issues are user error. Like how I didn't seat my primers enough. I reload for about 15 different cartridges and I've never had light strike issues with any of those, but yea my reloading process is wrong. Gotta love the internet sometimes.
 
tomcatfan said:
Perhaps, but using the same exact technique I'm able to unlock that achievement with my m1903, m1903a3, and my origin.

This does seem to be a trend though, all of my issues are user error. Like how I didn't seat my primers enough. I reload for about 15 different cartridges and I've never had light strike issues with any of those, but yea my reloading process is wrong. Gotta love the internet sometimes.
Click to expand...


Sorry Tomcat My ARC is still in the safe so haven't checked CRF. Finishing up loading 250 rounds of pre primed brass. Wish I new what they were so I could match it. Hate mixing primers in a loaded batch.

Internet is great. Anyone know what primer this is?
IMG_7230.jpg
 
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