The range ring on my MAS 49/56 grenade launcher moves freely and the button will not engage, will replacing the spring on the ring fix the issue?
Additionally looking for a clip to fix the grenade launcher sights. Mine seems to be missing. It is item 10, the circlip in this diagram. I have only found them on French websites and they won't ship to the states
Spring is to locate grenade to keep it on rifle as advancing. Seems common. Cleaning kit usually has a spare.
Nothing to do with ring not staying put. I expect spring/pin inside under button is stuck or broken. Soak in penetrating oil and lightly tap.
Clip is a different thing. Maybe an e-clip will suffice
I assume you found the circlip on Naturabuy - did you ask them if they could ship to the states ? also the spring is available at Libertytreecollectors and Numrich have a Grenade Launcher Kit that might include the circlip - you have to ask them