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FN PS90/P90 chamber honing tool — image 1
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FN PS90/P90 chamber honing tool

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Chamber honing tool for the FN P90/PS90. Designed to be used with lapping compound and a drill

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Model information

Category
Other Ideas
License
Creative Commons — Public Domain

I was experiencing some feeding issues with my PS90 with a CMMG barrel. The feed lip on the chamber was very sharp and was causing damage to the brass, bullet setback, and failures to feed. This tool is meant to be used with lapping compound and a drill to add a small fillet to the chamber lip. Little RPM and pressure is needed to achieve a good result. 

This tool is designed to be printed at a 45 degree angle from the rotational axis. There is a flat on the end that fits in the drill chuck that should be oriented with the build surface. Non-abrasive filaments are needed to prevent damage to the chamber. Use at your own risk.