What is your goal in removing the top rail?
A “tricked out” bullseye gun will have the slide to rail fit hand lapped or the slide will be “welded up” then hand lapped (probably the case with a Springfield.) Tight rail fit is part of accurizing. You don’t get 2” groups at 50 yards without compromises- run that gun wet (break free on the rails) and keep it meticulously clean or it will act up.
It’s probably got it’s feed ramp cut for wadcutters. It will still feed ball, but someone spent money so it will feed target wadcutters.
The top rail stiffens the slide and adds mass. The Ultradot on top adds mass.
The extra weight is there to tame recoil and get rapid fire scores up. Bullseye rapid fire is a shot every 2 seconds. Someone spent money for that.
With all that extra weight up to and designed to shoot target wadcutters, you’ll want to replace the spring, esp if running ammo hotter than target wadcutters or the slide will batter the frame.
Someone spent a lot of money to get that trigger as light and crisp as allowed by competition rules.
Before you go too far consider that you might be trying to make a race horse in to a tractor.
