This video addresses the common question of whether AR-15 bolt-carrier groups (BCGs) can be mixed and matched. The hosts explain that due to standardized manufacturing, most BCGs will fit an AR-15. However, they emphasize the critical importance of checking headspace using a NO-GO gauge after swapping a BCG. They caution that even if a spare BCG fits initially, significant barrel extension wear from prolonged use with another BCG can alter headspace, requiring re-evaluation. The video debunks the myth that mixing BCGs is always problematic, provided proper headspace checks are performed.
This video offers a comprehensive review of cartridge headspace, explaining its meaning and how different case designs influence it. While not essential for casual shooting, understanding headspace is crucial for those acquiring used, antique, or military firearms. The content also covers the identification and usage of headspace gauges, aiming to provide viewers with a deeper comprehension of their firearms and the ammunition they use.
This video provides a step-by-step guide on how to convert an AR-15 rifle from .223/5.56mm to .300 Blackout by changing the barrel. It details the necessary tools, including an Upper Receiver Action Block, Gas Block Roll Pin Punch Kit, AR-15 Armorer's Wrench, and a .300 Blackout Headspace Gauge. The demonstration focuses on the process of barrel replacement, making it a practical tutorial for AR-15 owners looking to modify their firearms for different calibers.
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