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Recoil Spring Day!
5" 1911 .45 ACP, OEM 16lb recoil springs, one fresh out of the package and one at ~4000 rounds, primarily standard pressure factory 230gr FMJ but more than a fair share of 230gr +P HST & T-Series. Weapon ran 100% with the used spring.
http://i140.photobucket.com/albums/r...oe/Recoil1.jpg
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Moduli of plasticity and elasticity, how do they work?
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Proof of theory that as things get older, they get shorter!
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It's always pretty cool when you replace all the springs. Feels like a new gun.
Just like you don't notice your horsepower slipping away until you get a tuneup. [Driver]