I have used the FAC Track for years and have now switched over to the F1 Mainframe. When I made the switch I also bought the large padded chest pouch, where the APSK is needed.
It made me really annoyed that I hadn't bought the chest pouch years earlier as it comes in handy all the time. Keep all the gear you use over and over again and have easy access as you won't need to take your pack off and on constantly. A dope feature of the chest pack is also that it doesn't just flip open so you drop all your stuff, but it opens up as a shelf so all your gear in it is safe from falling out.
Provides perfect mountiing for my bino pack or AM2P pouch. Once the mount is installed it's super easy to attach either pack or pouch and adjust for fit. Very convenient!
APSK - Pouch Chest Mount Kit
The Pouch Chest Mount Kit helps keep my pack weight down by eliminating the shoulder harness for my Nose Gunner. I can now attach it directly to my F1. It also works well with the A2MP Multipack accessory pouch. Wonderful product.
This A2MP pouch and chest mount system are a convenient size and provide easy access to my smaller items I carry while hunting. Thanks