Laser Ammo Action Cap - Replacement Back Caps for Dry Fire Practice 9MTA/DB Action Cap - Replacement Back Caps for Dry Fire Practice The dual function back cap can be used to replace any cap on all surestrike 9mm cartridges and can be used with all available caliber Adapters The dual function target Activator/boresight multi mode action cap protects your firing pin as a snap cap The target Activator cap is used to enhance dry Fire practice with point of impact recognition/feedback