On my gun Part 24 Valve End Plug appears to be sealed with teflon tape. The cap slot displays idiot marks common to guns thus old.
That bumper is very similar to Cat bumpers. The rubbery material is probably press fit.
As an aside, a Google search yields very few Line SI Promaster photos. Fewer still have the bumper.
That bumper is very similar to Cat bumpers. The rubbery material is probably press fit.
As an aside, a Google search yields very few Line SI Promaster photos. Fewer still have the bumper.
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