Direct Impingement just like the M&P 10. You should be good to go but not sure why it wont work this gas piston. A stock is a stock? You might want to call their customer support.
Maybe a trip to the local gunshop. Bob's Sunoco in Callaway has given me fair pricing in the past. You can always put it on consignment through their store as well.
Who would be regarded as the best tuner in SOMD? I just picked up an Agenda 6 from
3js but didnt have time to stay and tune! They set me up nice to get shooting but looking to dial it in even further! Any help would be great. I dont think I have the experience to do it myself.