re: Teach me about suppressed bolt action guns: Twist rates, barrel lengths, MOA, etc.

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While this is true in general, I don’t think the the short bull barrel of the 16.5” sps tactical is very susceptible to this. Neither mine, or my friend’s 16.5” SPS tactical has a noticeable change in POI when the suppressor is removed.

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All things being equal, shorter barrels are stiffer and don't give as long of a lever arm. Silencers may change accuracy, poi, and precision by adding weight at the end of the muzzle and by changing gas dynamics and input on the bullet. Different types of baffle geometry can change poi and accuracy just by gas influence on the bullet.