Starter SRS Upgrade Kit 2.0–2.5 Joule (Piston, Cylinder, Spring) sfmb Compatible with 14mm counterclockwise (CCW)

Compatible with 14mm counterclockwise (CCW) barrel threads

made from 6061 aluminum

Compatible only with original barrels from batch 4 and above

Must be used with 11

Starter SRS Upgrade Kit 2.0–2.5 Joule (Piston, Cylinder, Spring) sfmb Compatible with 14mm counterclockwise (CCW)The Starter package for your Silverback SRS. This upgrade kit makes your SRS consistent and silent! The package includes the following Stalker upgrades! The package includes the following Stalker upgrades. Stalker SRS Scorpion Ultimate Edition Stalker SRS Fluted Teflon Cylinder Stalker Official Logo Patch We strongly believe that the Rapax springs are the best springs on the market. The results with this spring and the Stalker upgrades are perfect.