Q&A for FN 509 Midsize 9mm Compensated Pistol Barrel Kit

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FN America + Gun Parts FNH USA Gun Parts FN 509 Midsize 9mm Compensated Pistol Barrel Kit FN 509 Midsize 9mm Compensated Pistol Barrel Kit Q&A FN America + Gun Parts FNH USA Gun Parts + Pistol Parts FNH USA Pistol Parts + Pistol Barrels FN America Pistol Barrels FN 509 Midsize 9mm Compensated Pistol Barrel Kit FN 509 Midsize 9mm Compensated Pistol Barrel Kit Q&A FN America + Gun Parts FNH USA Gun Parts + Pistol Parts FNH USA Pistol Parts FN 509 Midsize 9mm Compensated Pistol Barrel Kit FN 509 Midsize 9mm Compensated Pistol Barrel Kit Q&A

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FN 509 Midsize 9mm Compensated Pistol Barrel Kit

$349.00 $329.00 Save Up to 16%

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Q

Yoo Rj, guest, from AL, United States, asked on September 21, 2026

What size barrel FN would it fit?

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A

Answered by OpticsPlanet AI, on September 21, 2026

This kit is designed to fit the FN 509 Midsize, and it includes its own proprietary 4.55 in compensated barrel to replace the factory barrel.

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Q

Jay, guest, from IL, United States, asked on October 31, 2025

Are these types of comps legal in Illinois?

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FN America + Gun Parts FNH USA Gun Parts FN 509 Midsize 9mm Compensated Pistol Barrel Kit FN 509 Midsize 9mm Compensated Pistol Barrel Kit Q&A FN America + Gun Parts FNH USA Gun Parts + Pistol Parts FNH USA Pistol Parts + Pistol Barrels FN America Pistol Barrels FN 509 Midsize 9mm Compensated Pistol Barrel Kit FN 509 Midsize 9mm Compensated Pistol Barrel Kit Q&A FN America + Gun Parts FNH USA Gun Parts + Pistol Parts FNH USA Pistol Parts FN 509 Midsize 9mm Compensated Pistol Barrel Kit FN 509 Midsize 9mm Compensated Pistol Barrel Kit Q&A

Last updated 2025-11-12 UTC.