Why don't modern guns have integrated shot/round counters, as seen in sci-fi movies and video games? Surely, knowing exactly how many rounds you have left would be a major advantage in a
Cobalt Kinetics AR Rifle Round Counter (Shot Counter) on Cobalt Kinetics Evolve 3.0 3-Gun Competition/Tactical AR-15 Rifle/Carbine with Cobalt Advantage Reloading System (CARS)! (Videos!) – DefenseReview.com (DR): An online tactical technology and
FN SmartCore® Shot Counter – FN e-novation
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Modder adds FPS-style ammo counter to automatic weapon | Engadget
Radetec Offers 'SpeedShot' Automatic Round-Counting System « Daily Bulletin
M-RCC | Cycle Counter | MISUMI | MISUMI
NO. 1 Active RFID Shot Counter | ShotPM | Phoenix
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RISC - Radetec Inertial Shot Counter
Are there weapons with a bullet counter like in the games? - Quora