21.2mm POM Air Nozzle with O-ring for M4 – FPS Softair

A POM air nozzle from FPS Softair for most M4/M16 replicas on the market. Machined from solid stock on CNC equipment in an elastic, low-friction engineering polymer and fitted with an inner sealing O-ring, it replaces the original nozzle and improves the air seal during compression for more consistent shots. FPS Softair recommends it for replicas with roughly finished metal hop-up units. It is made in Italy by technicians with long experience in repairing and upgrading airsoft replicas.

Features and technical specifications

• Manufacturer: FPS Softair
• Manufacturer code: SPM4P
• Type: air nozzle for electric replicas (AEG)
• Compatibility: most M4/M16 replicas on the market
• Material: POM (engineering polymer), machined from solid stock on CNC equipment
• Seal: inner sealing O-ring
• Length: 21.2 mm
• Inner bore diameter: 5.4 mm
• Production: 100% Made in Italy
• Other versions available: in Ergal (SPM4E)
• Package contents: 1 air nozzle with O-ring

Installation

The nozzle fits on the tappet plate in place of the original, with the gearbox open, so it is a job for a technician or an experienced player. Before installing it, compare its length with the original nozzle and lubricate the cylinder head nozzle tube it slides on with silicone oil. After fitting, check that BBs feed reliably and that the nozzle seals properly against the hop-up bucking. The 5.4 mm inner bore is slightly tighter than on other nozzles: if your cylinder head nozzle tube is larger, the cylinder head should be replaced as well. For Tokyo Marui NGRS replicas there is the dedicated SPSRE nozzle.

Field use

POM, an elastic and very low-friction engineering polymer, copes better than a metal part with roughly finished metal hop-up units, such as those on some D|Boys and A&K replicas, and the inner O-ring limits air leaks around the cylinder head nozzle tube. It is the right choice when a metal nozzle struggles to slide or to seal properly against the bucking.