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<blockquote data-quote="BlackBelt" data-source="post: 5544973" data-attributes="member: 5867"><p>I use a 30 caliber Deadair Sandman S on 5.56 rifles. It works amazingly well considering its size. However, what other posters mentioned is correct. You have to get different mounts for different rifles, and in the case of the Sandman S used on a 5.56 rifle I bought a 5.56 endcap. That smaller hole in the 5.56 endcap makes a noticeable difference over the stock 30 cal endcap.</p><p></p><p>I was going to try the 30 cal Sandman S on my AK's, but my steel concentricity rod said "no-go". Most imported AK47's barrel threads are not concentric to the bore, while most USA made AK47 barrels are bore/thread concentric.</p><p></p><p>As far as steel vs 'other material' concentricty rods, dont worry about it. The important thing is that you DO check it with a concentricity rod.</p><p></p><p>I am a barrel freak and I can tell you with experience and authority that a properly sized steel concentricity rod will not harm the chrome lining or hardened steel of the inside of a barrel.</p><p></p><p>Think about it. A barrel is designed to handle extreme pressures while pushing a bullet made of any different number of metals and/or alloys tightly through it for tens of thousands of rounds.</p><p>A metal rod that drops through the barrel and out the other end freely doesn't put any wear or tear on that hardened barrel lining or on the hardened lands and grooves.</p><p></p><p>There are those that know, those that think they know, and those that dont know...all giving advice.</p><p></p><p>Like I said, the only really important thing is to get a concentricity rod (made of your choice of materials) and check that bore/thread concentricity.</p><p>Ive seen guys on the firing line shoot new cans off the ends of their rifles several times just because they didnt want to invest in a rod.</p><p></p><p>Edited to add: when DeadAir had their mounts on backorder I got mine from JMac Customs. I dont know if JMac makes DeadAirs mounts, but I cant tell any difference between them at all.</p></blockquote><p></p>
[QUOTE="BlackBelt, post: 5544973, member: 5867"] I use a 30 caliber Deadair Sandman S on 5.56 rifles. It works amazingly well considering its size. However, what other posters mentioned is correct. You have to get different mounts for different rifles, and in the case of the Sandman S used on a 5.56 rifle I bought a 5.56 endcap. That smaller hole in the 5.56 endcap makes a noticeable difference over the stock 30 cal endcap. I was going to try the 30 cal Sandman S on my AK's, but my steel concentricity rod said "no-go". Most imported AK47's barrel threads are not concentric to the bore, while most USA made AK47 barrels are bore/thread concentric. As far as steel vs 'other material' concentricty rods, dont worry about it. The important thing is that you DO check it with a concentricity rod. I am a barrel freak and I can tell you with experience and authority that a properly sized steel concentricity rod will not harm the chrome lining or hardened steel of the inside of a barrel. Think about it. A barrel is designed to handle extreme pressures while pushing a bullet made of any different number of metals and/or alloys tightly through it for tens of thousands of rounds. A metal rod that drops through the barrel and out the other end freely doesn't put any wear or tear on that hardened barrel lining or on the hardened lands and grooves. There are those that know, those that think they know, and those that dont know...all giving advice. Like I said, the only really important thing is to get a concentricity rod (made of your choice of materials) and check that bore/thread concentricity. Ive seen guys on the firing line shoot new cans off the ends of their rifles several times just because they didnt want to invest in a rod. Edited to add: when DeadAir had their mounts on backorder I got mine from JMac Customs. I dont know if JMac makes DeadAirs mounts, but I cant tell any difference between them at all. [/QUOTE]
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