OBZ from United States, NJ Public Profile

I purchased this tube and recoil spring/buffer for a 762 build. After opening the package I noticed that this spring felt very heavy.
I proceeded to finish the build using this spring and buffer tube.
Well I guess you know the outcome, it did not cycle.
After measuring the spring and comparing it to a std mil spec AR15 223/556 I noticed a big difference in the coil spring wire diameter.
It measured .080 mind you , a std AR15 .223/.556 measures .074. It might not seem a lot, (.006) but when you are compressing the spring to a specific length, it matters. It took almost 35% more pressure to collapse the spring to be equal to a .223/.556

I have read other reviews stating this kit works great.
I think this kit had the wrong spring
In my opinion, this spring will only work on a 308
I will contact Optics Planet to see if they will exchange or refund my purchase