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Old June 1, 2008, 10:52 PM   #4
Join Date: February 12, 2001
Location: DFW Area
Posts: 21,027
The top picture shows one installed. It replaces the rear pin in the 10/22 receiver and provides something other than steel-to-steel contact for the bolt when it reaches the end of travel.

It also buffers the force by providing some shock-absorption so that the bolt impact is not transmitted directly to the aluminum receiver. In a silenced 10/22, I suppose it also reduces the action noise somewhat.
Did you know that there is a TEXAS State Rifle Association?
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