Does such an item exist? My kid found an old promag mount (arms 18 copy) but the mount doesn't have a dovetail piece for the rear stripper clip guide mounting location. There's just an allen head screw, angled back.
You would need to match the mount to the charger guide support mount. Highly doubt you could find or buy just that piece.
What previous poster mentioned - ProMag = JUNK.
The M-1A side mount is already a weak & inconsistent mount even with the better makers like ARMS. Using Pro-Mag is just plain ... "Unwise"
LIFE'S JOURNEY IS NOT TO ARRIVE AT THE GRAVE SAFELY IN A WELL PRESERVED BODY, BUT RATHER TO SKID IN SIDEWAYS, TOTALLY WORN OUT SHOUTING "HOLY $H!T...WHAT A RIDE"!!