Design Features You Wouldn't Miss

I'll second the above and add:
Automatic safety
Dedicated handedness - Please make things ambidextrous!
Non regulated PCP's - Not necessarily a feature, but frequently done to keep an entry level gun inexpensive.
Anything over 100 FPE - Not that I don't enjoy them, I just do not want to blur the lines into firearms restrictions.
 
● Muzzles that aren't 1/2" UNF. (Can we, please, agree on a standard?)

● High scope rails, especially on bullpups. (There is half a dozen economic ways to increase scope height if you so desire — but the only way to reduce it with a high built-in rail is to chop the rail... 🤦‍♂️)

Matthias
 
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I'll add...

- Plastic/Polymer triggers.

- Safety selectors on the trigger or inside the trigger guard.

- Shallow magazines that won't accept Predator Polymags or certain length slugs.

- No single shot trays included or the ability to single load for fat fingers.

That's just a few I can think of for the moment.