All of our uppers are built on MIL Spec uppers and bolt carrier assemblies. We use the same match grade barrels that our competitive shooters use.
We use a YHM Diamond Series Handguard and a standard A2 flash suppressor. Our barrels are made to the proper specs for an OPS, Inc. collar and suppressor if you ever want to install one.
If you want to build something different than what we offer on the web, please give us a call, we will be more than happy to work with you.