After 2012 batches came in with metal injection molded bolts. Some receivers are cast as opposing to forged and machined.
It's not as cut and dry as "year x has these" either.
I'm currently building a tuned lightweight one off a 2013 stamped import. It had a forged/machined receiver and a forged machined bolt.
It's easy to spot a MIM bolt. On the underside you'll see small circles in the steel on both sides of the bolt from the mold injection process.
These are bad. The amount of physical force exerted on that piece of steel in the m14 design is phenominal. That being said the norc forged bolts are rock solid and good to go.
Having a cast receiver is not necessarily a bad thing IF good quality materials and methods are used. I've not heard any instances of these being problematic.
You can spot a cast receiver easily. Check the underside of the receiver at the rear for a visible middle/symmetrical seam frim the cast process. If you don't see this and there's classic machined with a potato tool marks all over it instead then its 99% it's forged and machined.
They sold new for 399 back in the day...but this one was almost new in the box shipped to my door for 500 off the EE.
I made sure it was a forged bolt/receiver via asking for detailed pics before comitting.
Guys are all but giving them away these days to buy the new NR AR10 that are flooding the market.
Educate yourself a little on the platform and reap the rewards brother!
