That is correct. Rc 60-62 for target sound about right? Will need normalized post processing, core refined & case hardened (will have to consult treatment sheet to double/triple check). Is going to take a large diameter chunk if I don't want to weld on it--about 2.37+/-. Piece I have will be JUST big enough. I noticed the bolt face on the FS2000 actually fits into an ar15 barrel extension after minor clearancing for the FS's large profile extractor. The opposite is true as well, except that the bolt heads have different engagement depths in regards to head spacing, but at least I can use an M4 as an easy shaping guide for the FS extension.
2012-11-21_21.20.36.jpg2012-11-21_21.04.37.jpg2012-11-21_20.55.32.jpgAny pointers or input are appreciated.