The Atom Custom 4S hop-up unit ensures excellent hop-up performance even in Nordic weather conditions! The Atom Custom 4S hop-up unit is made from durable, rigid polymer. This polymer material choice helps prevent the hop-up rubber from freezing in cold environments and naturally performs exceptionally well in rainy autumn weather and summer conditions.
The hop-up adjustment on the Atom Custom 4S is done via a large adjustment wheel aligned with the barrel. The adjustment wheel maintains its setting precisely thanks to a dedicated locking ring. This securely adjustable hop-up unit provides maximum accuracy and performance. For the best results, use the 4S M4 hop-up unit together with Atom Custom ZERO precision barrels.
