Picked up the mp5-22 rifle as well. If anyone has questions on the stocks, I think so. This is the 10rd which is in the full size mag but blocked. : r/ MP5
HK MP5, SP5K, HK94 9mm 30-Round Magazine
H&K MP5 30 Round Magazine Training Aid Weighted
H&K MP5 K-PDW BB Magazine | Airgun Depot
PTR 9CT: The Affordable HK MP5 - The Shooter's Log