Ultimate Cylinder 401-450mm (M4A1/SR16)
Ultimate Cylinder 401-450mm (M4A1/SR16).
The cylinder is made of steel and have been surface treated to ensure low friction and high durability. The placement and size of the decompression holes have been designed to help give maximum compression thus increasing the effect.
For M4A1/SR16, with an internal barrel length of 401-450 mm.