I only have one in 6.8spc and can't say enough good about it they are beyond others i know of regarding make i purrchased it from wilson combat if that helps.
It is a dual lobstertail LMT bolt in a LMT carrier finished in Np3 not sure if Wilson Combat is still using them due to cost as they are pretty damn cosltly by thier standards but am very satified so far.
Their are many on this forum more qualified than me to comment on build quality so i will leave it at that.