Five lb connector and NY1 cause spring in ALL of these. What I have noticed around these 8 guns (a lot more so While using the 6 G30's of all three configurations, but nonetheless considerably present in the two G21's) is the following - Obviously there is the KKM 10mm https://how-do-i-buy-a-gock-30-ge80122.rimmablog.com/32076259/glock-30-gen-4-an-overview