Just traded my r700 for a DPMS lr308. The gun has a 16" barrel, carbine gas system. The previous owner had the collapsible stock swapped for a rifle stock. Once I got the thing home I noticed the bolt would only stay back with a mag in place. After playing with the mag catch I realized the buffer is too long to allow the carrier to ride far enough back for it to catch on the bolt face. With a mag in the bolt was only stopping on my mag follower. The buffer in the gun is 5 7/8" long and the spring is 12 7/8" long. So my only guess is that this buffer and spring combo is too long to let the carrier ride far enough back. I reassembled the gun with no buffer, only the buffer spring and it all functioned as it should. Can anyone tell me what is the correct length buffer and spring and maybe sell me one at the same time lol.