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I had this on a Burris 2-10@44 thermal core fx38q , I could zoom right into 10x and still make out the target. But a little pixelated.

I've had my forward clipon shoot from my zero at 100m, to dialed up at 327m and still hit square on where my cross hairs were.

I have a pulsar corefx38 I could let go of if someone interested

I've used a few resr clip on.. my biggest problem is the extra length towards your eye. I prefer my thermal forward clip on. That's great!