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<blockquote data-quote="Buck Fever" data-source="post: 1952702" data-attributes="member: 113501"><p>I can't say much about the others but the ARC nucleus is a 3 lug design with a 72° bolt throw so you get more scope clearance but marginally heavier bolt lift because you are cocking essentially the same firing pin over less degrees of lift. That's the trade off compared to 2 lug designs.</p><p></p><p>Beside that it is CRF with a similar to Mauser claw style extractor (not exactly the same), a Springfield style inertial ejector, interchangeable bolt heads, toroidal bolt lug geometry, Savage small shank threads, a recoil lug located by the scope rail which is also a scope rail recoil lug, probably the strongest bolt stop in the industry and I'm probably forgetting features.</p><p></p><p>It can use a Savage style barrel nut, shouldered prefit barrels or the Barloc barrel tensioner system. All of the ARC actions use the same barrel tenon so the shouldered prefit I have on my Archimedes would fit my Nucleus (if I swapped in a Magnum bolt head) but what I have installed is my Proof Research carbon fiber wrapped Savage prefit with a barrel nut type Barloc. I really like the Barloc, it makes the gun buildable with Allen keys and Torx keys, no receiver wrench or barrel vise required. I have a trick for easier assembly than the ARC instructions allow which ensures the tensioner won't bottom out. If you go for a Barloc, ask me about it.</p><p></p><p>One thing about the Nucleus is that the bolt body and receiver are machined so the bolt tightens up in the receiver as it closes but when it opens it has clearance to prevent binding and stoppages due to powder residue, dirt, sand, etc. It's easy to cycle but has that bit of slop to ensure reliability.</p><p></p><p>It's very good but I don't have the others to compare it against.</p><p></p><p>I think it is the most feature rich of the "budget" actions. The quality and the company behind it are first rate. My Nucleus is a 1.0 from the initial production and ARC has updated it to eliminate the issues the action had. My Archimedes was also a 1.0 and updated. I say that not because they were perfect, but because ARC stood behind them and made them right.</p><p></p><p>The Nucleus is at 2.0 currently and I think you will get "perfection" if you buy now.</p></blockquote><p></p>
[QUOTE="Buck Fever, post: 1952702, member: 113501"] I can't say much about the others but the ARC nucleus is a 3 lug design with a 72° bolt throw so you get more scope clearance but marginally heavier bolt lift because you are cocking essentially the same firing pin over less degrees of lift. That's the trade off compared to 2 lug designs. Beside that it is CRF with a similar to Mauser claw style extractor (not exactly the same), a Springfield style inertial ejector, interchangeable bolt heads, toroidal bolt lug geometry, Savage small shank threads, a recoil lug located by the scope rail which is also a scope rail recoil lug, probably the strongest bolt stop in the industry and I'm probably forgetting features. It can use a Savage style barrel nut, shouldered prefit barrels or the Barloc barrel tensioner system. All of the ARC actions use the same barrel tenon so the shouldered prefit I have on my Archimedes would fit my Nucleus (if I swapped in a Magnum bolt head) but what I have installed is my Proof Research carbon fiber wrapped Savage prefit with a barrel nut type Barloc. I really like the Barloc, it makes the gun buildable with Allen keys and Torx keys, no receiver wrench or barrel vise required. I have a trick for easier assembly than the ARC instructions allow which ensures the tensioner won't bottom out. If you go for a Barloc, ask me about it. One thing about the Nucleus is that the bolt body and receiver are machined so the bolt tightens up in the receiver as it closes but when it opens it has clearance to prevent binding and stoppages due to powder residue, dirt, sand, etc. It's easy to cycle but has that bit of slop to ensure reliability. It's very good but I don't have the others to compare it against. I think it is the most feature rich of the "budget" actions. The quality and the company behind it are first rate. My Nucleus is a 1.0 from the initial production and ARC has updated it to eliminate the issues the action had. My Archimedes was also a 1.0 and updated. I say that not because they were perfect, but because ARC stood behind them and made them right. The Nucleus is at 2.0 currently and I think you will get "perfection" if you buy now. [/QUOTE]
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