Tan m4 has never been used had it as a backup tameia conection 18:1 gears.

350fps

Specna arms m4 has recently been upgraded with 13:1 gears cyma Zeus fcu trigger new spring cyma high speed motor

Deans conection. 350fps

Motor height and gear shimming tuned

(17 rps with 7.4 lipo battery)

( 28 rps with a 11.4 lipo battery)

Selling to fund a hpa build.