The Troy Industries Gas Block Mounted Front Sight. It's been a long wait, but Troy has engineered a rugged, reliable, combat ready BattleSight that mounts securely on the gas block. It offers all of the features of Troy's other Folding BattleSights: Easy to operate, clicks solidly into place and folds out of the way when not needed.
Specifications and Features:
HK Troy Industries front gas block BattleSight
Mounts securely on the gas block
Easy to operated
Clicks solidly into place
Built in swivel attachments
Flat Dark Earth finish
Made in the USA
Note: Not compatible with 4 sided railed gas blocks.