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most of the parts are metal Features and Specifications: Manufacturer Number: G2-K421-A000-0P Standard lower parts kit for AR-15 platform firearms Stainless Steel hammer and trigger Pistol grip and trigger assembly included Finish: Black Fits: AR-15 lower receivers
Edgar, Almost all parts are metal. If your looking at this lower kit the roll pins are coiled they bend and twist and are not the quality of slotted roll pins. Beware.
Same deal Edgar. This is a metal "Mil-Spec kit Sir. https://www.google.com/search?q=661799410205&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiv6Nvh5JfjAhUDhOAKHUzAAYwQ_AUIEigD&biw=1280&bih=596#imgrc=3YfGYPCBbbCH1M:
