Upgrades listed are: Customizable trigger pull adjuster
Power feeder
Pre-expansion chamber
Velocity lock bolt / kit
and much more
https://imgur.com/gallery/ObHWk
Upgrades listed are: Customizable trigger pull adjuster
Power feeder
Pre-expansion chamber
Velocity lock bolt / kit
and much more
https://imgur.com/gallery/ObHWk
$200 to $250