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Select and install the Silverback VKS 0, +250 µm or +500 µm hop nub with the correct concave orientation and anti-jam checks.

Change the Silverback VKS main spring safely: control the spring guide, use the trigger to seat it and chronograph after reassembly.

Strip, clean and reassemble the Silverback VKS 63-BB magazine with a 5 mm pin, flat screwdriver and final follower-release test.

Adjust the VKS piston sear for reliable catch and safe trigger weight: initial clearance, two-turn fine setting and complete safety checks.

Install an SRS outer barrel with FAST hop in a Silverback VKS, refit the lock pin at 4 Nm and replace the external hop wheel with the supplied cover.

Convert the Silverback VKS bolt operation from right to left with the official visual sequence, compatible handle reference and final function checks.

Extend and stabilise a Silverback VKS inner barrel with the official 467/571 mm limits, 4 Nm receiver torque, O-ring positions, hop-up orientation and silencer assembly.