Don't buy it - Armaspec AR-15/AR-10 Stealth Recoil Spring

I bought one last year and I didn't buy it from optics planet. It's absolute junk don't buy at any price. It broke after 80 rounds and jammed up my rifle. I couldn't pull the upper off, I had to remove my buttstock and buffer tube to remove it. I've bought the JP Enterprise captured buffer to replace it. It's about 2.5 times more expensive but worth every penny. I love JP's because I don't run with a buffer retention pin after I had one break the tip of and jammed my trigger. It doesn't come flying out when I break my rifle down. It replaced 2 parts and made my rifle cycle smoother.