Does anyone know what steel LMT uses in their barrels?  4140 or 4150?

Thanks..

I believe they use 4150, which is a chrome moly steel.  And they also chrome line....At least the 10.3 of  mine, and the 14.5 as marked.  Not sure on the 16....

We really need to get something tacked on barrel steels, and the differences and who uses what.

Thanks MH, I have been shopping for an M-4 type upper (2nd one) and I really like the LMT's, but I want to make sure I get 4150, chrome lined, and 1/7 twist on this one.  

I haven't been able to find any listing on what the steel was in their barrels.

This is what a poster said about the barrel steel made at Macsteel, the makers of the steel for Colt barrels:

"As far as the material goes the most common grade for rifle barrels is 4140 with elevated levels of sulfure to aid in machinability. However, some customers do use lower sulfur because of their process. The receivers and cylinders for fire-arms are typically made out of 1137/38 material (High Sulfur). The material for the AR-15's is a modified 4150 with elevated Vanaduim."

The thread is here: Finally got to see barrels being rolled at MACSTEEL

I don't know if LMT gets their barrel steel from Macsteel, but I would think the chances of that are pretty good.