380 ACP, not much bolt weight is needed to safely operate the mechanism. The operating mechanism in straight blowback firearms purely utilizes spring weight and bolt weight to ensure that extraction happens well after the pressure inside of the case has dropped to safe levels. Why do I loathe straight blowback so much? WELL, let me indoctrinate you with some ‘ facts’. 45 based AR for quite some time now, but as you probably already know, I’m not a fan of straight blowback. For me, it was always two things: A lack of available magazines that work in standard AR Lowers, and that the only options were straight blowback. While AR-45s have been around for decades now, they’ve always had some kind of issue or complication that made the platform unattractive. 45 ACP, I’m hoping that you find this blog post useful. For those of you out there that are in pursuit of building an AR-15 chambered in.
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