Psywar,
You might try contacting these guys
Sage International
They make the Less Lethal nock-off version of the MGL.
On the Less Lethal version you have to manually spin the cylinder about 6 times in order for it to engage it. I don't know how the MGL works but I know that some guys have had trouble with the springs on the Less Lethal one binding. Maybe they can help you out.