Check out Airsoftparts.ca
I would not bother with a red dot ACOG.
If you want the option of magnification or no magnification with a RDS...then go with an EOTech + 3-4x magnifier like the picture...or with an Aimpoint + magnifier. If you don't like the flip to the side mounts for the magnifier (I don't think any of the clone ones are rock solid)...then simply go with a mount that is easy to put on/off. My magnifier mount has a good sized hex nut to tighten it...I can either torque it on pretty tight with my fingers or else use a wrench/pliers. I've NEVER had to put it on/off/on/off/on/off during a game. 99% of the time it's either on the gun throughout or taken off at the beginning and never put back on. The one occasion so far I've had it mounted and taken off was when I popped it off to use as a monocular...and then it ended up staying in my pocket for the duration.
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