Your AR-15 Isn't Mil-Spec and That's OK
This video clarifies that most civilian AR-15s are not 'Mil-Spec' and explains that adherence to military tolerances and dimensions is more critical than strict Mil-Spec compliance. The instructor emphasizes that the bolt carrier group (BCG) and barrel are the most important components for a quality AR-15 build, advising viewers to invest most of their budget in these parts to avoid potential issues like headspace, cycling, feeding, and accuracy problems. While Mil-Spec coatings like phosphate are mentioned, the focus remains on dimensional accuracy for reliable function.













