Q: What Calibers and rifles will this work for?
A: The AR-15 platform cambered in .223, 5.56, or 300 blackout. More calibers and rifles to come...
Q: What will The Mag Feeder be made out of?
A: A high grade nylon filled polymer to match or exceed high grade magazines currently on the market.
Q: Will it fold itself and put itself in an ammo box like the animated picture?
A: No, sorry no motors or sky hooks to make it do anything on its own...but maybe one day.