Well, it finally arrived today. It is a mil-spec BCG, tool marks and all, coated in something that is thinner than hardchrome, but quite slippery feeling. The hammer was kinda rough, not polished, and took a few dry fires and re-charges to feel better. The coating has some thickness too it as the bolt is tight in the carrier with standard 3 piece rings. The entire group is coated evenly. The instructions say to use a stainless steel brush to clean it, honestly, and that any solvent or cleaner is safe as well. I cannot wait to shoot it a few hundred rounds to see how it feels with and without the suppressor. I am going to run it in an 18" rifle in front of a standard carbine buffer and ISMI spring. I will report my findings here occasionally, but it will be at least 4-5 days before I can shoot.