Kraken SRS S2 Hop-Up Arm SP-STAL-166 Springs are manufactured with tight

Springs are manufactured with tight tolerances on diameter to eliminate the "twang" sound common in airsoft sniper replicas

Slide the square spacer onto the inner barrel

This hop-up chamber is fully CNC machined from aircraft-grade aluminum

Unique serial number with realistic deep engraved markings

Kraken SRS S2 Hop-Up Arm SP-STAL-166 Springs are manufactured with tightStalker SRS Kraken S2 Hop Up Arm This Stalker SRS Kraken S2 arm is made from a single piece of aluminum, featuring a pre molded bump on topno additional bump needed for chamber contact. The arm has a long Prowler style bump profile, designed for optimal compatibility with large hop up windows and or large deformation patches. For example, this arm works best with Stalker Morpheus barrels, most GBB barrels, or barrels with large square hop up windows