Techt G4/G3 Spec-R L7 Bolt Engine Factory Spare Parts This product works best with

This product works best with VFC / Elite Force MP5 Magazines

E-grip sear (this sear just has a round hole in the middle of it not as lot or oval)

Hop-up: Adjustable

plated 5000 psi rated

Techt G4/G3 Spec-R L7 Bolt Engine Factory Spare Parts This product works best withThe TechT G3 Spec R G4 L7 Bolt Engine totally reconfigures the Stock G3 Spec R G4's method of operation. By replacing the stock style bolt with the proven L7 style bolt head, performance is increased on every level. Lower operating pressure, shorter dwells, better consistency, better efficiency, lower sound signature the works. It is constructed of high grade aircraft aluminum and goes through our licensed anodizing method to make them both durable