Based on my Vavang linear comp on a 18" bull barrel AR in 5.56.
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1) Do they have any effect on dampening recoil as some companies claim?
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Not really noticeable.
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2) Do they reduce muzzle jump/climb as some companies claim?
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Yes, minor reduction. There are comps that do a much better job but you pay a noise penalty.
The Lavang is pretty good at reducing noise to the shooter.