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From the picture it looks like the mag release is screwed on properly.

I have a few 20 round Master Molder Thermold plastic mags and they function fine in 4 ARs. Do they lock in with an open bolt? If so, but not with a closed bolt, you may have to download them to 18 rounds to lock in with a closed bolt.

If you continue to have trouble, at least the Thermolds are only $2.99 apiece! :D I like mine but only for practice.
 
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