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This is the mag that I have ....is this the one you're speaking of?
https://cmmginc.com/product/magazine-9-ar-conversion-30rd/
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Yeah....that won't work with your Spikes straight blowback upper or any straight blowback upper since the ejector is in the lower on those.
See MEAN arms website
https://www.meanarms.com/products/detail/endomag-9mmClick on the drop down like you are going to order and notice they sell the CMMG version also...that is what you have which requires using their barrel/BCG.
See this video by mrgunsngear.
I've already confirmed with MEAN that they do indeed make the inserts for CMMG.
As he mentions in his video, I'm also not a fan of using them in straight blowbacks since you have to remember to leave the mag in the gun to clear a live round.
I'm also not a fan of any straight blowback 9mm's either. You can see them comment on that also at the end of the video regarding how the CMMG is smoother.
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