This video from School of the American Rifle announces the re-availability of SOTAR BCG bore gauges, offered in two versions: one with a US-made handle and another with an imported handle. The organizer tray, made by Suppressor Tools.com, is also highlighted as a way to keep these gauges organized. The instructor emphasizes that these gauges are for checking dimensional efficiency within the bolt carrier, not for determining good or bad status.
This video explains the function of AR-15 bolt tail gauges, also known as gas efficiency gauges. These tools measure the bolt tail diameter to ensure proper gas system sealing. An undersized bolt tail can lead to gas leaks, causing inefficient operation, while an oversized one can also cause issues. The gauges help identify bolts that are too small for optimal performance.
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