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4mm Sight Raising Block Wanted

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Take care if you end up with the Centra 4 mm block

It is held on with 4 or 6 hexbolts which tighten down onto the action.


If you are in the habit of taking off the block between shoots, or for different positions, then it is almost impossible to get back to the same degree of tightening, and the zero point has moved.


Furthermore, because the hexbolts can be tightened so easily, overtightening will bend the alu block itself, until ultimately the chamfer at either side can no longer fit on the rail - too wide



I use one, but it never comes off the rifle so this isn't a problem



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