These were made from USGI Prints. They are 4140 heat treated. Nitride Finish on them. Super Hard. The shop that made them was going off of very old paper prints and when we got them back we noticed some minor details that were not cut into the rails. I have made a video which is posted below detailing what those are and what needs to be done to run these rails. We did finish some of them and they are currently in running guns.
To take each of these sets and finish them ourselves would not be worth the time. So we are selling at a heavily discounted price and modifying our cad file and re-cutting them. This would be a good opportunity for those mechanically inclined to get a high quality set of rails cheap.