So I set out to build a Piston AR Pistol that could use a folding brace and still fire while folded. It took over a year and a few bucks (ok more then a few......) Here is what is going on from front to back.
ARAK-21 Upper in OD Green ambi-eject with 12.5 inch 5.56 (1in8)
Kaw Valley linear comp
Mako PTK\VTS combo
Troy HK style Back up Iron Sights
Eotech 512
Magpul Rail Covers
Troy rail-mount QD point (part of my system to keep the brace folded)
Quinten Defense Lower
Rogers Tactical Mag Well Grip (works with Gen3 Pmags)
Anderson Rifle Lower Parts Kit
Yankee Hill EZ pull Pivot and Takedown pins
KNS Anti-Rotation pins OD Green
Odin Works extended mag release OD Green
Battle Arms ambi safety selector OD Green
Areo Precision Trigger Guard OD Green
Magpul K2 Pistol Grip OD Green
Law Tactical Gen 3 Folder
Black Creek Precision SB15 buffer tube extension (not made any more that I can find)
Sig Tac SB15 brace
Phase 5 Tactical SB15 replacement strap OD Green
Magpul MS1-MS3 QD Adapter Ranger Green (part of my system to keep the brace folded)
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Over all I keep it folded while I shoot, but have the option to have a brace incase some stabilization is needed.