I used to think Systema was pretty good for its bolt stop feature, back when it was the only one that did it. Then TM did it cheaper and mechanically, and the GBBRs hit the industry in force.
Originally Posted by m102404
This has a lot to do with the motor and gearing. You can tap/feather the trigger and still have it shoot. You can't do that with an AEG.
Sure you can tap/feather AEG triggers and still get complete cycles. It used to involve pretty crazy FPS, or a microswitch trigger system with a good battery (it's very hard to get a partial cycle on my Star).
Nowadays it's just a Trigger Master away.