@TonyTheTiger is spot on…. I’ve run both adjustable gas blocks and keys, and prefer a good adjustable gas block.
Be prepared to get frustrated though! For me anyway, changing something as simple as going from one spring to another for example was always having weird effects on the cycling, and I’d have to adjust the gas block a lot more than I was expecting.
On my uber-light no tax stamp AR15 (tubbs flat wire, taccom UL buffers (2-piece version), DSA aluminum carrier, mid-length gas, adjustable gas block), I got it working pretty quickly:
But my more standard regular lightweight gun, was a complete pain in the ass setting up with an adjustable gas key on the Boomfab titanium carrier (V7 non-adjustable gas block). Finally got it running right with a Sprinco white spring and a regular carbine buffer:
Learned my lesson on that one, and went with an adjustable gas block on the next iteration (also with a boomfab carrier), and it runs great with a regular carbine spring and buffer; much wider operating envelope for the gas too…
Still working on the final setup for my “lightweight” AR10; finally got it running right with the much lighter V7 titanium carrier, but not super happy with the recoil and not sure if I want to go heavier or lighter on the buffer yet.
I am using the bolt with the dual ejectors from the KAK BCG in the V7 carrier now though