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It claims to be milspec I'd check out this great review of this model though below. https://www.guns.com/news/reviews/plum-crazy-ar-15-gen-ii-rifle-review-video-plastic-polymer-upper-lower-et-arms#Specs

Hi Christopher and welcome. The buffer tube, hammer, trigger, and sear are all polymer. That buffer tube is mil-spec in size with a carbine-length spring. The Plum Crazy safety, however, can be engaged while the hammer is forward. Not a deal breaker, but it means it is not mil-spec in this regard. Cheers and stay safe!