Instruction from Caleb and Steve at Brownells clarifies the meaning of 'Mil-Spec' in firearms components. They explain that true Mil-Spec involves military production and inspection, while civilian market 'Mil-Spec' often refers to dimensional standards or quality benchmarks without official certification. The video highlights receiver extensions and upper receivers as examples, emphasizing that Mil-Spec generally signifies higher quality materials and manufacturing, not necessarily the lowest cost.
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