There is a gas cylinder for the VSR, but it's pretty hard to get it, as it's almost always out of stock everywhere (in stock right now at UNC for 108$). There are ''silent dampers'' available from laylax to put on the cylinder head. It will absorb a bit of the ''smack'' from the piston, but with a 150 in there, don't expect it to be perfectly silent. A silencer can really help quite a bit too for bolt actions.
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