I have two and thay both have functioned flawlessly. Probalby 2000 rounds throught them both, handloads and BlackHills.
Earlier posts are correct about the chrome lining of the barrels. In combat, no doubt, on the range, not necessary and a slight detriment to accuracy as stated earlier.
The ABCD's of AR-15s, Armalite, Bushy, Colt, DPMS...