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Rifles, Reloading, Optics, Equipment
Rimfire and Airguns
Savage B.Mag 17 Winchester Super Mag Teardown
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<blockquote data-quote="varmintH8R" data-source="post: 938095" data-attributes="member: 39801"><p>OregonReloader- </p><p></p><p>Thanks for your detailed post. I have some quick feedback for you on your attempts to free-float the factory stock. </p><p></p><p>Typically, inexpensive plastic rifle stocks are made from reinforced polypropylene. Without getting into the science of plastics, it is a crystalline material and somewhat prone to warp (depending on how it is tooled and what type of reinforcement is used). It is also prone to having issues with "molded in stress". </p><p></p><p>Basically, that means a part can come out of the mold in a certain geometry, but the stress from how it was shot and cooled means it I has internal stresses trying to pull it out of that shape. The only thing holding it in place is the strength of the polypropylene material itself. When the part (in this case stock) gets warm due to increased ambient temperature or sunload, the polypropylene begins to soften just a bit and that nasty "molded in stress" shows itself. </p><p></p><p>My guess would be that the BMag stock has been poorly designed for manufacture, and has issues with molded in stress. When you heat it up, physically alter it, and let it cool in the correct shape this is probably a temporary fix. Unless you really wrench on it to break some of the crystalline domains in the material, the next time the stock heats up it will likely go right back to its stress free - and non floating - shape. </p><p></p><p>Good luck</p><p></p><p>Brandon</p></blockquote><p></p>
[QUOTE="varmintH8R, post: 938095, member: 39801"] OregonReloader- Thanks for your detailed post. I have some quick feedback for you on your attempts to free-float the factory stock. Typically, inexpensive plastic rifle stocks are made from reinforced polypropylene. Without getting into the science of plastics, it is a crystalline material and somewhat prone to warp (depending on how it is tooled and what type of reinforcement is used). It is also prone to having issues with "molded in stress". Basically, that means a part can come out of the mold in a certain geometry, but the stress from how it was shot and cooled means it I has internal stresses trying to pull it out of that shape. The only thing holding it in place is the strength of the polypropylene material itself. When the part (in this case stock) gets warm due to increased ambient temperature or sunload, the polypropylene begins to soften just a bit and that nasty "molded in stress" shows itself. My guess would be that the BMag stock has been poorly designed for manufacture, and has issues with molded in stress. When you heat it up, physically alter it, and let it cool in the correct shape this is probably a temporary fix. Unless you really wrench on it to break some of the crystalline domains in the material, the next time the stock heats up it will likely go right back to its stress free - and non floating - shape. Good luck Brandon [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Savage B.Mag 17 Winchester Super Mag Teardown
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