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The Range
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Sightmark Scopes
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<blockquote data-quote="Rob72" data-source="post: 1169350" data-attributes="member: 707"><p>Recoil in a bolt action is one direction and linear (more or less straight back). Becuase a semi-auto cycles itself, and uses some variation of gas or energy transfer, it also has a comparatively rough/abrupt forward motion (reverse recoil, if you will). A decent scope, using an etched reticle and metal to metal adjustment, and a modestly stout (one-piece) tube will suffer this force for many, many rounds, assuming it is also properly mounted.</p><p></p><p>So, basically, a bolt snaps back; a semi snaps back-forward. Twice the motion with a sharp transition phase.</p><p></p><p>"Economy" scopes have the tendency to be 2 or more piece body(seams weaken and allow gas seepage/condensation internally), lower quality metal/metal, or metal/plastic contact points (wear quickly, unreliable repetition of adjustment), and some still use wire reticles, which, with enough flex and motion, will snap.</p></blockquote><p></p>
[QUOTE="Rob72, post: 1169350, member: 707"] Recoil in a bolt action is one direction and linear (more or less straight back). Becuase a semi-auto cycles itself, and uses some variation of gas or energy transfer, it also has a comparatively rough/abrupt forward motion (reverse recoil, if you will). A decent scope, using an etched reticle and metal to metal adjustment, and a modestly stout (one-piece) tube will suffer this force for many, many rounds, assuming it is also properly mounted. So, basically, a bolt snaps back; a semi snaps back-forward. Twice the motion with a sharp transition phase. "Economy" scopes have the tendency to be 2 or more piece body(seams weaken and allow gas seepage/condensation internally), lower quality metal/metal, or metal/plastic contact points (wear quickly, unreliable repetition of adjustment), and some still use wire reticles, which, with enough flex and motion, will snap. [/QUOTE]
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