Here's a simple solution to stop ROTF Deluxe Ratchet's gun from popping out of his right arm, without the need for any heavy modifications. I believe the problem is due to the springs used by the factory to be a little too strong, instead of a heavy design flaw. The solution is to weaken the springs slightly.

1. The right arm.


2. Pull out the two grey bits and have them folded like so.


3. Using a piece of twist tie, hook the grey bit and wrap the twist tie around the arm tightly to keep everything in place.


4. Don't touch it for about 2 - 3 days, wait for the springs to weaken slightly.