I’m a municipal police officer assigned as an SRO. We’re looking to enhance our capabilities when responding to an active shooter. Currently we carry Glock 22’s. I suggested adding a RMR or Aimpoint ACRO to our duty gun. Admin wants us to carry a weapon with a stock. We are currently looking at the Brügger and Thomet TP9/MP9. I need a way to discretely/ securely carry the weapon. Small, low profile backpack is what I’m looking for (additionally attached to the belt with a pistol lanyard) Thoughts?