![]() ![]() Officially called a receiver extension, the buffer tube is the cylindrical aluminum housing that contains your AR-15's buffer and recoil spring. If you're a first-time builder shopping around for the parts you need to finish your rifle or pistol build, you've probably come across a myriad of buffer tubes that talk about "mil-spec" and "commercial" diameters and such. This quick lil' guide explains the similarities and differences between mil-spec and commercial AR-15 buffer tubes. ![]() "Isn't mil-spec better than commercial? I want what the military uses!" That's a question and a statement often made by so many black rifle builders and shooters.
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