This extension increases the Plenum’s length by another 22cc, for a total of 57 cc with the Priest I & II; and a total of 92cc for the P-3. This provides more air for the pellet/slug, which can result in higher velocities (or lower air consumption).
The P-3 can take 2 plenum extensions, taking total volume to 114cc.
Length: 7.5cm
Diameter: 2cm
The Plenum extension is compatible with any of the RTI Airguns:
