Raven cylinder, Raven tapered cylinder head, Raven piston and Raven spring guide in one convenient set. This particular assembly is for the ARES AW338 spring bolt action rifle.
Raven (PDI) is a top premium line of products; if you are modifying your weapon for top performance, Raven is a good choice. Besides being smooth, reliable and robust the tapered head also smooths out the air flow which improves shot-to-shot consistency even further than an already well sealed setup.
Also fits Ares MS338 and MS700