This started out life as a project back around 2002. A full trademarks Systema MK12 SPR.
Now has a 590mm 6.01 barrel, and a polarstar gearbox with silver nozzle. The stock on the SPR is longer than other m16 stocks, so it was a project getting the polarstar computer hooked up, but its all together and shooting great now.
Also coupled with a 90ci 4500psi carbon fiber HPA tank and a Redline Airsoft Delta regulator.