Properly Installed and bore-sighted
MANUFACTURER: Shadow Systems
MODEL: MR920 Combat
TYPE: Semi-Auto Pistol
ACTION: Striker Fired
CALIBER/GAUGE: 9mm
FINISH: Black Nitride
FINISH TYPE: Applied Finish
FRAME: Polymer Frame
STOCK/GRIPS: Black Frame
BARREL: 4.5"
OVERALL LENGTH: 7.63"
RATE-OF-TWIST: 1-in-10"
CAPACITY: 15 + 1
# OF MAGAZINES: 2
MAG DESCRIPTION: 15 rd.
SIGHTS: FS: Green Tritium RS:Black
SIGHT TYPE: Night Sights
THREAD PATTERN: 1/2x28
SPECIAL: Threaded Barrel Model
SAFETY FEATURES: No Manual Safety
ADDL INFO: Optics Ready Combat Slide
ADDL INFO: Spiral Fluted Black Barrel
ADDL INFO: Flat Face Aluminum Trigger
MFG MODEL NO: SS-1004

Features Holosun 507C-X2 optic
https://www.ko-firearms.com/in-store/specials-5779/mr920-cbt-151-optic-ready-threaded-barrel-wholosun-507c-x2-4297155