I have the exact same problem with my clone 553 and 4x magnifier on my CA m4. I took a stationary verticle belt sander (so I could get a nice clean, even sanding) and did the whole length of the top rail. I sanded down just ONE side of the body and the TOP tapered edge of that side. I have the same problem on my new CA SPR...back to the sander!
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Ronin 49 Team Member
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