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.
20200809_003730.jpg
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.
20200809_003730.jpg
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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