Piat Tuned 909s Accuracy Troubles
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Topic: Piat Tuned 909s Accuracy Troubles (Read 1749 times))
Chickenthief
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Posts: 250
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Real Name: Henrik
Re: Piat Tuned 909s Accuracy Troubles
«
Reply #40 on:
July 05, 2022, 06:19:55 AM »
If you end up thinking of cutting the barrel then consider this: Chuck it in a lathe and back bore it from the muzzle until you have cleaned the restriction. Done that on several old military rifles that had damaged crowns from front cleaning with iron rods.
That or lap it. Insert a rag from the front and put in a used brass barrel brush, Cast/pour lead around it.
Now attach a cleaning rod and retract the casting about half way out the barrrel. Apply automotive valve grinding paste and work over the "ring" until little resistance is felt, Reapply paste and repeat. You may end up having to cast 2-3 plugs as they grow smaller and the "ring" grows larger.
«
Last Edit: July 05, 2022, 06:24:31 AM by Chickenthief
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Greg_E
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Posts: 1380
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Real Name: Greg
Re: Piat Tuned 909s Accuracy Troubles
«
Reply #41 on:
July 05, 2022, 10:38:34 PM »
For final clean up after valve grinding compound, I'm finding that a product called White Diamond works really well to polish out the fine scratches. It also cuts fast on just a cotton pellet. Been using it on barrels and polished out a Lee sizing die. The last 0.0005 on the sizing die were really slow because all the rough parts had been made smooth.
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Piat Tuned 909s Accuracy Troubles