The PMAG-20 Gen M3 uses the same spring and followers as the PMAG-30 Gen M3. That's why it's longer than the old 'Nam issue 20-rounder.
The PMAG-40 Gen M3 uses a different spring, same follower and has a lock plate marked special for the 40 rounder.
The PMAG-20 Gen M3 uses the same spring and followers as the PMAG-30 Gen M3. That's why it's longer than the old 'Nam issue 20-rounder.
The PMAG-40 Gen M3 uses a different spring, same follower and has a lock plate marked special for the 40 rounder.
