I get wanting to have a trade-off for the largest mag benefit, but for how similar appended mag is with no downside I don’t see the point. I don’t think the AE bonus merits it. Personally, I think the reload penalty should be cut by half or 2/3. The perk should feel good to use.
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Extended and appended should be rolled into one perk. Or at least make it so they don't drop as both slots of a weapon, I have a 4/5 adept exalted truth that would be perfect but its mag perks are appended and extended mag.