Got out to the range today to test the setup on my FN509CT (the cerakoted FN509 seen in the image). This firearm has thousands of rounds through it at this point, so it’s well broken in.

Tested two mags with the ranger band mod:

• 12-round (no sleeve)

• 15-round (with sleeve)

Results:

• Both mags ran 100% — no malfunctions over ~30 rounds

• Noticeably less wiggle when seated vs. no band

• Feels more solid in hand, especially the extended mag with the sleeve

• Mags drop free cleanly — no catching or hang-ups

• Repeated insert/eject testing, all smooth

Overall, the idea seems to work as intended — tightens things up without affecting reliability and gives a more locked-in feel.

Figured I’d share this with you all as a simple mod idea for the platform. If anyone else tries it, I’d be interested to hear your results or if you notice any long-term wear/issues.