The GGP compatible Glock 19 match grade barrel is constructed of 416R stainless steel with 0.003" dimension and a proprietary twist rate. This model is threaded with 1/2"x28 ti threads.
Specifications:

Caliber or Gauge
Length	4.02"
Model	GGP
Twist
Sights	None
Bore Type
Finish	Nitride
Type
Chokes Included
Choke Configuration
Barrel Type	Match Grade
Ammo Type
Barrel Features	Threaded