The 3-piece set of FPS Delayer DL04 is tailored for technicians and advanced users who perform frequent maintenance or upgrades and require ready spare parts. The DL03 is a timing accessory made of loaded technopolymer that delays tappet-plate opening and postpones closure, improving magazine feeding and reducing power drop during sustained bursts.

Designed with industry specialists and fully manufactured in Italy, the DL04 requires a modest modification to the tappet-rod fin to operate correctly. The three-unit set ensures fast replacement, consistent tuning across several replicas and stock of spare parts for workshop use.

Concrete benefits: improved power consistency in bursts, better feeding reliability at high cyclic rates, durable construction and guaranteed compatibility from Italian production.

Technical features & specifications

Product type: tappet-plate / tappet-rod delayer

Model: DL04 (Nikk Sakk design)

Material: loaded technopolymer engineered for timing precision and strength

Function: delay tappet-plate opening, postpone closure and aid BB positioning in rapid-fire scenarios

Compatibility: V2 and V3 gearboxes (Marui-style / AEG standard)

Manufacture: 100% Made in Italy

Installation note: requires modification of tappet-rod fin; professional installation recommended

Package contents

3 × FPS DELAYER DL04 (3-piece set)

Warnings & maintenance

Do not tamper: do not grind, reshape or alter the delayer; unauthorised modifications can impair gearbox operation and create unsafe conditions.

Installation: gearbox disassembly and tappet-fin modification required—use a qualified technician if unsure to prevent damage to gears, piston or tappet-plate.

Post-installation checks: perform low-rate testing and inspect for abnormal wear after fitting; verify correct timing before operational use.

Storage: store in a dry, temperate environment; avoid exposure to chemicals or environments that may degrade polymer components.

Testing safety: wear eye protection during bench tests; keep out of reach of children.
These warnings are written in clear language and comply with GPSR Regulation and applicable Italian law.