Highly quality Piston is made of Polyamid PA 6.6 with Carbon Fibers and Molybdenum. The Piston doesn´t have second Cog and the half of third one. It prevents creating of choking or more precisely immediate destruction of the Piston. Thanks to used material belongs this Piston to the most durable on the market. Classical Piston with 16 cogs.It is intended for Springs SP130 SP190.
Steel Crest has 16 Steel cogs. These are made of Spring Steel by chipless machining. Then it is hardened and abraded. All the processes are operated by computer. Freshly, the Crest has extended retaining area and improved support of plastic Body so it doesn´t yank out.
The Crest is made of Steel, no dust like are Chinese products made of!
You can buy it
in the Cylinder Set.
We recommend to grease the grooves for Piston sliding and cogs by Teflon Vaseline. This Piston is the best choice for high level upgrades. In case of big choking (dirt in the Barrel) your Cogged Wheels won´t be destroyed, just the Piston Body will but it could be purchased again at low cost. Nevertheless Piston´s Body has great lifetime.
New type of favourite component which is placed in front of the gearbox. It is intended for M4/M15/M16/SR25 and for HK416 too (after small modification of the body; depends on the producer). The gun must have HOP-UP Chamber with the T shape and the metal body.
Installation of the SDG (= Stop defect gearbox) is very simple and easy. Just divide the halves of the body, insert SDG, put together and tighten the screws up.
This type of SDG prevents the screws to loosen thanks to bevelled tighting screws. You can use high-powered upgrade and no worries about break the gearbox as well.
We recommned for all of the spring forces