This video from Smyth Busters addresses a critical question for AR-15 owners: the difference and compatibility between 5.56 NATO and .223 Remington ammunition. It emphasizes the importance of adhering to SAAMI (Sporting Arms & Manufacturers' Institute) standards for ammunition and firearm compatibility. The video explains that 5.56 NATO is a military round with higher pressure than .223 Remington, and firing 5.56 in a firearm chambered for a tighter .223 SAAMI-spec chamber can lead to increased wear and ammunition failures like pierced or blown primers. The key takeaway is to match the ammunition type to the marking on the barrel of the firearm, especially when receivers are marked 'Cal. MULTI'.
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