Alpha Parts Systema PTW Gas Tube (7.5-9.5 inch, Stainless Steel) Compatible with M4 GBBR

The Alpha Parts stainless tell gas tube for the Systema PTW or GBB M4 series is an optional upgrade to match with the Alpha Parts mock gas block or other standard mock gas blocks for the previously stated platforms. Compatibility: Systema PTW M4 Series Gas Blowback M4 Series Outer barrel length: 7.5" - 9.5"