This guide details how to perform a field strip of an AR-15 platform rifle, emphasizing the use of a loaded cartridge as a tool for disassembly, front sight adjustment, and takedown pin manipulation, as demonstrated by an expert instructor. It also highlights the function of the drainage grommet in the A2 buttstock.
This YouTube video from Brownells introduces and showcases the Precision Mic Cartridge Headspace Tool, manufactured by RCBS. The video focuses on this specific gunsmithing tool, providing information for potential buyers or users interested in cartridge headspace measurement for firearms.
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