I definitely like the clean, utilitarian yet still aesthetically pleasing look of it. To to me it has an 552 Commando appearance to it, which I'm modeling and basing my prospective ARPistol build after. I guess due to the ribbed (for her/his pleasure

Was torn between the SBA3 or the SOB brace Although the SOB would give it the triangular stock look, ultimately the SBA3 with its adjustment capability is much more flexible, so went with that.
Also found this HK style rotating drum rear sight from Brownells:
https://www.brownells.com/rifle-parts/s ... x?psize=96
So far changed out the dust cover to a Strike Industries polymer and put a SilencerCo ASR 3 prong flash hider
Still playing with the timing, shims and such. I noticed that against the barrel shoulder, it is rounded. It deformed and rounded off / concaved the shims I put against it when just test hand tightening the flash hider against it. I don't know if that will present an issue since it is not truly flat. The original...I guess "lock / indexing nut" that came with the bird cage flash hider, although it is not a crush washer. I wonder if their intent of using it is because both sides are "flat" or rather much flatter than the rounded barrel shoulder, so to provided a much flatter surface to mount FH / MB too?
Basically if anyone can chime in what their experience with mounting different FH / MB with. Did you keep the use of the original "lock / indexing nut" or whatever that is, or did away with it completely?
My only real complaint is, and although I do like the clean simple look and especially the form factor of hand guard. That unlike the 552 Commando which appears to have attachment points to screw pic rail sections into. Aside from that small section on top of the hand guard with the 2 thread holes for the grenade launcher sight, there seems very limited options for mounting accessories. Other than changing to a quad pic rail or key mod / m-lok, which I noticed is offered here in the store page (just rarely in stock from my understanding). But I have no intention of ever changing to, or rather that particular form factor offered here. Seems I will have to come up with some kitchen gun smithing with some pic rail sections in order to mount a light / PEQ box. I wonder what the Taiwanese Army solution or rather doctrine and tactics for low light / night fighting i.e. NVG is.