the subject of the clamp-style gas block/sight assemblies and how susceptible they are to movement due to constant pressure from a sling or impact has been brought up before.
it's a no brainer that a taper-pinned gas block is the most secure and damage to other parts of the rifle, including the front sight will occur first before the gas block moves on a barrel.
i talked to the guys at vltor, and asked if they'd be willing to perform a test to see how much it actually takes to move a properly installed clamp-on gas block, like their VST-C1 or a PRI. they were interested in the results as well, and happily agreed. an impact test would have been too complicated to set up and quantify with so many variables, so we decided to go with a simple torque test. username and password are both 'mm' to view larger photos.
http://www.militarymorons.com/weapon...s2.html#torque


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