I have a CM 040C and I found I needed to file it a bit to get it to fit. It fits now but my stock is a bit off center. It doesn't change how it feels and it's difficult to see so it doesn't much matter. It is also a bit wobbly, I've put some double sided tape in to stop it wobbling as much. It works fine overall, just needed a tad off filing and is a bit wobbly. It is worth the price.
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