Any who has use the “ProMag Archangel Precision Rifle Stock on a Ruger Mini 30, I’d appreciate your thoughts on it. I’m thinking of getting one.

New Mini. Using Ruger 5 round mags and nato ammo. Jams every 3-5 rounds. Stovepipes every ten rounds. Double feeds every 4-5 rounds. What in blazes is wrong with this new gun? OK there's an archangel stock on it.