I built a 300 blkout pistol on an ar frame and used standard gas parts. when I tried to shoot the gun it would not cycle without jambs. so read up a little from other sources and found out I may have been overgassed because of the barrel length.
So I ordered the new spiral gas line and an adjustable gas block for my gun. that way I can decide how much gas return I need to cycle the gun effectively, without too much gas causing the bolt to over speed. the items I needed were available from optics planet at a good price.