Crunchy Frog
Member
A friend of mine purchased three .300 uppers (one a 16") from Hardened Arms and gives them high marks. https://www.hardenedarms.com/ They also sell by auction on GunBroker, might save you a little money.
I've also seen good reports on uppers from Radical Firearms; they are a little more expensive but they offer some high end rails. http://www.radicalfirearms.com/
I've also seen good reports on uppers from Radical Firearms; they are a little more expensive but they offer some high end rails. http://www.radicalfirearms.com/