I seem to remember that the nylon blocks main jobs was to help out the scopes. The hard steel pin puts an impulse up into the scope. That I think came from Richard Wilhelm who used to be a scope guru.
I made a couple back in the day but it was a PITA to machine down on the lathe I had. Bit thin for the length.
Would've bought one in a heartbeat now for 10 bucks but it's still in there.
Mine did shoot well under an inch at 50 but last time I tried it it was closer to the inch or more.
I would be fair and say I was never that great at cleaning the barrel. Could have a carbonated up chamber or anything
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