Hi everyone, thank you for the opinions. Some comments from my side… The handguard (for 550 mm and 508 mm barrels) is produced from the whole piece aluminum applied in aircraft building. It is installed instead of a standard handle and is fixed by a nipple at the end of the barrel.Handguard’s special design allows servicing gas piston without removing the handguard itself. It also allows using a release button and is removed together with the barrel. The weight without side rails is 350 gram. Bipods, forend grip could be fixed on the rails. Moreover, the hand guard allows holding AUG in the hands in max comfortable position. At the distance of 100 meters, no influence on hit point displacement is detected. The handguard can be without side rails, the side rails can be used when necessary. In case on any questions do not hesitate to contact me personally.