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Paul, looking at the barrel assemblies on Del-ton's website, my guess is 4140. Del-ton Customer Service can confirm this at Phone: 910-645-2172

Paul - DelTon isn't specific on this matter. The 4140 vs 4150 debate has been going on a long time, and actually it only signifies whether a barrel has .4% carbon or ..5% carbon. The .5% was created for 'mil spec' (govt spec) rifles, because it was believed to add a little durability when firing sustained automatic fire. Since we as civilians don't rally engage in 'sustained automatic fire' as do our soldiers, the difference is actually meaningless. Neither has been found to be more accurate than the other. And for our 'range' use, neither has really been found to be more durable. Some manufacturers flaunt one over the other, for marketing purposes. It's really a sort of "You say Tomato, I say Tomahto" type thing. Either will give you satisfactory performance in everyday semi-auto fire, and neither will make any difference in how long the barrel is going to last. 99% of users today will never wear out a barrel anyway. I know that doesn't answer your question, but perhaps it wi