Five lb connector and NY1 induce spring in ALL of them. What I've observed about these EIGHT guns (more so with the 6 G30's of all three configurations, but still to some degree current in The 2 G21's) is the next - My guess would be that the Gen4 G36 https://paxtonoepzi.total-blog.com/how-where-can-i-buy-a-glock-30-online-can-save-you-time-stress-and-money-58088132