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Rifles, Reloading, Optics, Equipment
Gunsmithing
Purple residue from cleaning
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<blockquote data-quote="Hugnot" data-source="post: 2764232" data-attributes="member: 115658"><p>Motor oil contains: </p><p></p><p><strong>surfactants</strong> (plural noun)</p><p></p><ol> <li data-xf-list-type="ol"><strong>a substance which tends to reduce the surface tension of a liquid in which it is dissolved.</strong></li> </ol><p>This stuff enables the liquid, like synthetic oil in this situation, to float away and suspend various particles that would be deposited on internal surfaces. In the situation described it is likely this is a "direct impingement" AR where gasses containing bullet, primer, and powder residue are diverted back via gas tube to provide impulse force to operate the bolt carrier. The residue stuff would have color, and this would be seen on cleaning rags.</p><p></p><p>I like to use motor oil as a cleaning agent but stop at using it as a lubricant.</p></blockquote><p></p>
[QUOTE="Hugnot, post: 2764232, member: 115658"] Motor oil contains: [B]surfactants[/B] (plural noun) [LIST=1] [*][B]a substance which tends to reduce the surface tension of a liquid in which it is dissolved.[/B] [/LIST] This stuff enables the liquid, like synthetic oil in this situation, to float away and suspend various particles that would be deposited on internal surfaces. In the situation described it is likely this is a "direct impingement" AR where gasses containing bullet, primer, and powder residue are diverted back via gas tube to provide impulse force to operate the bolt carrier. The residue stuff would have color, and this would be seen on cleaning rags. I like to use motor oil as a cleaning agent but stop at using it as a lubricant. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
Purple residue from cleaning
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