5 lb connector and NY1 cause spring in ALL of them. What I've observed more than these 8 guns (extra so with the six G30's of all three configurations, but nevertheless somewhat existing in the two G21's) is the next - It is lighter and you get extra felt recoil https://where-can-i-buy-a-glock-369134.idblogmaker.com/32050237/glock-30-gen-4-things-to-know-before-you-buy