The cylinder is made of steel and has been surface treated to ensure low friction and high durability. The placement and size of the decompression holes has been designed to help give maximum compression thus increasing the effect. For AUG/G3/M16A2/AK series, with an internal barrel length of 451-550 mm. ULTIMATE®’s cylinder parts are designed to give the best possible air compression and durability. For this reason we recommend always using ULTIMATE® cylinder parts and not combining or mixing with other upgrade parts as this can effect the result and performance of the upgrade.
