WTT Surefire DSF-870 for Surefire DSF-500

[User Name:]

I have a gently used Surefire DSF-870 that i'd like to trade for a Surefire DSF 500.

my model fits Remington 870's and i'd like to trade it for the same model that fits the Mossberg 500.

Link to what I have

https://www.surefire.com/products/illumination/weapon-lights/dsf-870/

Link to what I want

https://www.surefire.com/products/illumination/weapon-lights/dsf-500-590-shotgun-forend-weaponlight/