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Hi Nike, Franklin Armory says " Works in most AR platforms and calibers including 5.56 NATO, 308 Win, 300 BLK, 9mm, Rimfire, etc.... * Compatible with most Bolt Carrier Groups (BCG) Trigger pin size is.154" No 80% lowers, No polymer lowers, No Carbon lowers Stay safe & have a great day!

Hi Nike and welcome. this will work in the FN 15 M4 Military Collector 223 Remington without issue. Cheers, stay safe and enjoy!

This will absolutely fit and function properly as intended.