It did what the description says it was supposed to do - Strike Industries AR Pistol Flat Wire Spring

If youre running some type of rapid fire trigger on your pistol, this spring will not only help your AR pistol run softer and smoother but also help mitigate bolt bounce (a common cause of light primer strikes.) It’s not just your buffer weight that helps stop bolt bounce but a resonant combination of buffer weight and spring. If youre one of the lucky few that has a full auto AR pistol, this will definitely be a nice upgrade since it’s tuned to run full auto. If you have a carbine, get the carbine length FWS. You’ll need the extra tension to counter the higher gas flow.