Yes. If you break your SureFire you call SureFire on 800 828 8809 and explain what happened.
It is likely that they will send you a replacement bezel.
I should point out that both the G2 and G2Z have non-user replaceable lenses as they are secured by the same method.
SureFire does have Lexan lens replacement kits for specific bezels:
If you have a Classic 1" diameter Lexan lens SureFire bezel such as a 6Z or 9P etc, SureFire's Z17 lens replacement kit is what you need.
If you have a Classic Shock Isolated Bezel (Z32) [for example on your WeaponLight], SureFire's Z19 lens replacement kit is what you need.
If you have a Classic 8X, SureFire's Z30 lens replacement kit is what you need.
If you have a Classic 9N, SureFire's R90 replacement Bezel (with Lamp Assembly) is what you need.
Al