Definitely start off with the regular carbine buffer. I am running a carbine buffer and the Tubbs SSS flat wire springs that I bought from BCT (great service btw, springs arrived about 2 days after purchase). With this setup and my 18" SS bison barrel, I am getting consisten ejections between 3:30 and 4:00 with 90gr TNT and 29.5-29.7 grains of Re7.
I would not recommend the Endine buffer. I bought one for my rifle to begin with. I would have to say that with the endine, Tubbs spring and FSC30 comp, recoil was practically nothing. However, no matter how hot or mild the load was I could not get the bolt to lock all the way back on the last round. I switched back to the carbine buffer and haven't had a problem since.
I would not recommend the Endine buffer. I bought one for my rifle to begin with. I would have to say that with the endine, Tubbs spring and FSC30 comp, recoil was practically nothing. However, no matter how hot or mild the load was I could not get the bolt to lock all the way back on the last round. I switched back to the carbine buffer and haven't had a problem since.
