NexxSpeed Enhanced Recoil Spring for Tokyo Marui HI-CAPA 5.1 Airsoft Pistols
(Model: 140%)

"snappy, nice that it comes with 2. wish they did a hammer/recoil set, but it's a good spring. definitely speeds up the cyclic rate, but soft enough to ensure good lock back

"updating my last review, it works great, but the gold finish flakes off and leaves metal shavings in the internals of the gun under use. not great for longevity and feel. I'd go for a spring with no coating. still works well after i cleaned it off though