The 10.8" HBI handguard looks good, but I'm going to run it stock for a while. I have heard that the latest OEM gas regulator with the three holes (vs. two in the original model) is fine with most ammo types, so don't need to replace that with the HBI regulator or recoil spring (I don't think so, anyway).
The Lingle lower is tempting for the AK mag compatibility, but I don't feel the need for it, even if I had a chance in hell of finding one.
I bought two CPD DuraMag SS 7.62x39mm 10 round magazines, and I am assured by G4C that it comes with the AR15 magazine insert so I can use them.
I have a MS4 Magpul sling lined up and the QD mount to match, haven't decided what fore grip to use - think I'll wait to see how I feel about the handguard length before I do. I'm liking the BCM KAG grip that I have on my PCC, but may go Magpul AFG-2
I'll sight in the irons, then put on my Primary Arms SLx MD-25 with ACSS reticle. Eventually I want to put an Apex Edge 1-10x24 LPVO or a similar LPVO on it.
I've heard the OEM trigger is pretty decent, so I'll probably leave that for now as well.