The rear sight is adjustable and the front sight is a fixed green fiber optic. The weight is 42 oz. ruger.com/products/gp100/specSheets/1757.html

Kevin, this pistol has a fixed Green Fiber Optic Front Sight, an adjustable Rear Sight and weighs 42ozs empty and 43.2ozs with 10rds of 36gr hollow point 22lr ammunition.

adj rear with a green fiber front Model Number: 1757 Caliber: 22 LR
GripsCushioned Rubber with Hardwood Insert
Front SightFiber Optic
Barrel Length5.50"
MaterialStainless Steel
Capacity10
Rear SightAdjustable
Twist1:16" RH
FinishSatin Stainless
Overall Length11"
Weight42 oz.
Grooves6
Triple-locking cylinder is locked into the frame at the front, rear and bottom for more positive alignment and dependable operation shot after shot.
Grip frame design easily accommodates a wide variety of custom grips.
Takedown of integrated subassemblies requires no special tools and allows for easy maintenance and assembly.
Transfer bar mechanism provides an unparalleled measure of security against accidental discharge. https://ruger.com/products/gp100/specSheets/1757.html