Recover Tactical 20/20Series GB20 Glass Breaker w/ Optic Mount Attachment Black. GB20 features an optic mount w/ a compact removable 4-slot picatinny rail. Please note: The Stabilizer is no longer compatible with the G7 Holster when GB20 is installed. Specifications for Recover Tactical 20/20Series GB20 Glass Breaker w/ Optic Mount Attachment: Manufacturer: Recover Tactical Color: Black Features of Recover Tactical 20/20Series GB20 Glass Breaker w/ Optic Mount Attachment Includes mounting hardware Package Contents: Recover Tactical 20/20Series GB20 Glass Breaker w/ Optic Mount Attachment Recover Tactical GB20-01: 20/20Series GB20 Glass Breaker w/ Optic Mount Attachment Black