All I can say is I had a long chat with them today and they apparently are manufacturing from the last rev of TRW drawings and they claim to have a full set of TRW gauges they are using to manufacture.
They claim that the US military has sample rifles right now that they are evaluating against GI for acceptance trials, at which point they would become an official USGI supplier of NSN parts and complete rifles.
It seems to be their business model to sell primarily to the US government, not to us consumers.
I guess we'll have to wait and see, but review should be coming in soon considering they just started shipping complete rifles and machined forged receivers out to customers.
They also make a cast receiver machined to GI spec, but obviously the complete unit would not be milspec as it's not forged. Technically the SEI receivers are not milspec either as they are machined from billet and milspec allows only for forgings.
That I know of, the ONLY milspec receiver available before these 762mmfirearms receivers came out was the LRB which is also machined from a drop-forging.
SEI did, at one time provide new receivers to the Navy, but I'm not sure if they still are or not???
I wonder if the receivers that US military is buying today are equipped with the select-fire features or not? All the ones I've seen in service were fitted with selector locks.