Do you even 308 bro? - Strike Industries AR-10 Flat Wire Spring

First off, the negative reviews on this spring are nonsense. It absolutely does fully compress in a carbine tube. If it's not fully compressing, then the issue is the knuckle dragger who installed the spring tried to put a carbine buffer in the tube, not a 308 buffer. Also, if you can't exert the oomph needed to get this spring into the tube, you probably don't have the body mass to take 308 recoil and should stick to 556. Now, the spring is absolutely stuff, and it does require more effort to fit it all in the tube, but once you have it set, it's very smooth and consistent. It feels much better than a traditional piano wire spring. Cost is reasonable for being an upgraded spring, comparables cost even more. Cost to value ratio is stellar. Similar to a Tubb spring in feel and performance.