This cartridge is amazing...

[pavementends]

I figured it out! Nothing out of this world but still in infancy and teething.

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Interesting, thank you Grayfox. I'll check that and hopefully the Superlative Arms adjustable block isn't off from whatever that is. It behaves like it's short stroking yet locks back on an empty mag always and extractly with authority. I'll keep troubleshooting or single feeding!  Hahahahaha

Off topic but my google foo is failing me.  What stock is this?
Thanks pavementends