I agree totally with the guide rod as a better way to go, but wanted the lowbrow method to show up for those who may not have access to equipment.
Actually that lock at the back of the co2 changer is a great idea, IMO. The one I handled at Exotic Sportz last week had it. I will simply integrate a trigger into the lever ring that releases it mechanically.
I played last week against AgentJones, longtime friend who still uses the Miltec G2 I fixed up for him. Nostalgia moment for me