Hello everyone.
Sorry about possibly repeated question, did not find in FAQ (maybe I'm just blind or dumb).
Along with my recently acquired pre-banned Bushmaster A2, got two 20rd mags, also pre-94.
Mags are stamped on the bottom plate Adventure Line MFG, Inc. On test firing both of them consistently double fed last two rounds, while my other mags from various brands were fine, no matter which ammo (even .223 or 5.56) was used.
Assuming those were stored loaded for a long time - disassembled, stretched the springs, and lubed. That solved the problem for one of them, but not for the other one. Comparing side by side detected the feeder is slightly skewed and loose staggering right-left. Slight bending the lips did not help.
An obvious question - can that be cured, and does it worth that? I love the authentic look and low profile of 20rders. Specifying and clarifying questions are more than welcome, hence English is not my native language.
Thanks everyone in advance.

I’d trash them and get replacements.

This, reliability is paramount

Mags are disposable. Toss them and get new ones.

If the bodies are in good shape, you can replace the springs and put anti-tilt followers in. This will not be saving you any $$ over buying new ones and may only be worth the hassle if you want to keep them because they are pre-ban.

with mag issues, you start here => https://www.webstaurantstore.com/rubbermaid-fg263200yel-brute-32-gallon-yellow-trash-can/690FG2632YE.html

and then spend $4.99 here => https://globalordnance.com/shk-30rd-steel-ar15-magazines-upc-00850003223070/

Unless you are behind enemy lines.

OP, are you able to order replacement mags?