FMA Gas Block for M4 / M16 Outer Barrel — Black

Metal gas block by FMA for the outer barrel of M4 and M16 series airsoft replicas, with an internal diameter of 18.9 mm. It replaces or supplements the original gas block and serves as a mount for the mock gas tube on free-float handguard systems.

Retention is achieved via two set screws on the underside, which secure the block firmly to the outer barrel without requiring any structural modifications. Compatibility depends entirely on barrel diameter: the block cannot be fitted to replicas with an outer barrel other than 18.9 mm internal diameter. Not suitable for use on real firearms.

Key points

• Compatible with M4 and M16 series airsoft replicas with an outer barrel internal diameter of 18.9 mm
• Secured by two underside set screws for a stable grip on the outer barrel
• Suitable as a mock gas tube mount on free-float handguards that lack an integrated gas block
• Metal construction for an appearance and weight consistent with the replica's original components