I had quarters with the PSA ar10 spring and H buffer, but the 7.5 ounce buffer won't fit with any combination of springs I have without any quarters. I don't think there is anything else in the buffer tube. I'll shine a light down there this evening to make sure.Are there any quarters or spacers of any type in the tube?
I'm new to messing with buffers and springs... so don't hold this against me...I had a cheap unknown extra carbine spring to play with. I shortened/hacked it up quite a bit and still could not make the 7.5 ounce buffer and bolt go rearward enough to engage the LRBHO. The return pressure on the spring was really weak, it was funny how slow it closed the bolt.