Sig Sauer - MPX K-Sportline by Sig Air ( AEG )

The SIG Sauer MPX-K?is the smaller brother of the venerable SIG MPX, and just like its bigger brother has been taking the firearms market by storm. The SIG AIR Proforce MPX-K Sportline packs a modified version 2 gearbox which features a handy dandy quick change spring system to allow for switching out lighter or heavier springs for indoor or outdoor skirmishes, as well as full compatibility with most standard version 2 gearbox components like the piston assembly and rotary gears. The battery is wired to the front of the gun and it will take 7.4V - 9.6V batteries, please note that this gun will not take 11.1V batteries.