This Apex Tactical Specialties Apex Grade 9mm Luger 4" Barrel is not compatible with the LS Edge. You would need to use a 5" barrel for the LS Edge model, which Apex does offer, and can be found by using the link below:
https://www.apextactical.com/apex-9mm-threaded-barrel-for-fn-509
The Apex Tactical Specialties Apex Grade 9mm Barrel is not compatible with the FNX-9. The FNX-9 is not compatible with 509 barrels.
The Apex Tactical Specialties 105072 Apex Grade 9mm Luger 4" barrel includes a thread protector. It is only necessary if you wish to protect your threads when not in use.
This Apex 9mm Threaded Barrel is designed specifically for the FN 509 model pistols with a factory 4.00" barrel. This includes the FN 509 Midsize.
This Apex 9mm Threaded Barrel is designed specifically for the FN 509 model pistols with a factory 4.00" barrel. This includes the FN 509 Midsize. The thread protector will protrude 1/2" past the slide.
509c has a 3.7 long barrel so this 4 inch barrel would not work. Look for Apex FN 509c 3.7 barrel
This will not be compatible with the FNX series.
No it does not.
No it does not.
No it does not.