Caused failures to cycle. - Armaspec AR-15/AR-10 Stealth Recoil Spring

I’ve had this for about a year now and have been trying to find out why my ar wouldn’t cycle properly. I kept getting failures to feed. I tried their carbine and the H1 weights, tried an adjustable gas block, different lube, piston and DI. I replaced the upper receiver and buffer tube and still problems. I finally came to the Armadpec spring and put it in a friends AR and he had the same failures. What a headache. Now it just sits in a box and I have no idea what to do with it. I’ll just stick with the proven reliability of a good old standard buffer and spring.