I had a AR 15 pistol that I converted upper and lower to a rifle. I went with a A2 rifle buffer tube/spring/buffer. The upper is a 20" 6.5 Grendel.
I took it to the range to sight in and try some reloads. The reloads are 120 gr. Sierra's with Tac, starting point of 28.0 gr. and also some 28.4 gr. Start load is 25.8, max is 28.7 gr.
When shooting, the bolt wouldn't lock back on last round. Even pulling the charging handle back, it would lock back. If I pushed hard on the bolt release, it locked back until I let off. Then the bolt would go into battery. There is no sign of breakage on the bolt release lever. This lower, the only thing I changed was the buffer tube/buffer/ spring. I even reused the same bolt carrier, only changed out the bolt for the 6.5 Grendel.
So I did some changing around, swapping bolt carriers out. That didn't work. Swapped back. Then put the upper onto a carbine lower, and it locked back manually. I put the carbine upper on the rifle lower, and it wouldn't stay locked back.
My question, could the buffer spring be too strong? Or is the buffer too long? The tube/spring/buffer came as one package.
TIA!
I took it to the range to sight in and try some reloads. The reloads are 120 gr. Sierra's with Tac, starting point of 28.0 gr. and also some 28.4 gr. Start load is 25.8, max is 28.7 gr.
When shooting, the bolt wouldn't lock back on last round. Even pulling the charging handle back, it would lock back. If I pushed hard on the bolt release, it locked back until I let off. Then the bolt would go into battery. There is no sign of breakage on the bolt release lever. This lower, the only thing I changed was the buffer tube/buffer/ spring. I even reused the same bolt carrier, only changed out the bolt for the 6.5 Grendel.
So I did some changing around, swapping bolt carriers out. That didn't work. Swapped back. Then put the upper onto a carbine lower, and it locked back manually. I put the carbine upper on the rifle lower, and it wouldn't stay locked back.
My question, could the buffer spring be too strong? Or is the buffer too long? The tube/spring/buffer came as one package.
TIA!