Anthony, yes Sir it does. Accessories 1-12Rd & 1-15Rd magazine included. Cheers and stay safe Sir!

sorry I crossed to the mid size not the compact James and Trevor are correct SHIPS WITH
Two interchangeable backstraps
One 12-round and one 15-round magazine or two 10-round magazines
Owner’s manual
Locking device
FN logo soft pistol case https://fnamerica.com/products/fn-509-series/fn-509-compact-mrd-blk/

Correct, one 12, one 15-round

it comes with 2 -15 round magazines Description:
FNM FN 509MRD 9MM DA 15RD BLK
Brand:
FN America
Model:
509
Type:
Pistol: Semi-Auto
Caliber:
9MM
Finish:
Matte Black
Action:
Double Action
Stock:
Black Polymer with Mil-STD 1913 Accessory Rail
Sight:
Black Co-Witness
Barrel Length:
4
Overall Length:
7.4
Weight:
26.5 oz
Capacity:
15+1
# of Mags:
2
Receiver:
Black Checkered Polymer
Packaging:
Pistol Rug, Cable Lock
Features:
FN Optics Mount System, Interchangeable Backstraps;
Cold Hammer Forged SS Barrel, .4 Shorter Grip