Atom Custom 4S hop-up enables airsoft perfection throughout the year even in Nordic weather conditions! Atom Custom 4S hop-up is made of durable, inflexible polymer. The polymer material is perfect for freezing temperatures as it won’t freeze easily unlike metal hop-ups. The 4S hop-up works perfectly also in warm weather conditions.
You can adjust the 4S hop-up effect by rolling the big rotary adjust ring. The rotary ring keeps the settings the way they were set thanks to the separate locking ring. This gives your gun the maximal precision and performance. You get the best results using the 4S M4 hop-up together with our brilliant Atom Custom ZERO inner barrels.