Want to get a BCM Mk2 ELW barreled upper. But saw a few mentions of issues with certain 3rd party rails (like Geissele) that allegedly won't fit the new MK2 receiver. Not sure if that's a real issue. But before the order, wanted to check with guys here who upgrade AR gear more often than me.
- Are there certain quality/popular 3rd party rails, such as Geissele Mk14, that do not fit the BCM MK2 upper? On the flip side, are there quality/popular 3rd party rail brands that folks have verified DO fit, besides BCM's own MCMR?
- If wide compatibility with 3rd party rails is a concern in this case, am I better off sticking with the BCM (or other brand) standard upper, and skip the claimed benefits (I admit at this point, mostly theoretical) of the BCM MK2 upper?
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