which buffer is everyone using?

[VASCAR2]

I have been using a 16" 6.5 Grendel with six position Collapsable stock with a carbine buffer and spring. I switched to an H-2 buffer and started having extraction issues. I switched back to the factory carbine buffer and spring and No malfunctions since. I tried a T-2 buffer in my 20" Shilen AR 6.5 Grendel with adjustable gas block. I didn't need the T-2 and and I am using a stock buffer and spring in my six position Collapsable PSA stock.