EXM Innovations released last 11 August a demo of their V2 Amplifier which you can get with an Adapter Set and you can have more realistic sound generated when you fire your airsoft gun as long as it fits the amplifier... "System for adapting 14mm counter-clockwise (CCW) threads to Kmp9 and Kmp9R without disassembling the airsoft guns.

Features:

• Installation of EXM Innovations 2 in 1 V2 Adapter Set and Amplifier.
• Sound comparisons between our 4in and 6in amplifiers on a Kmp9R and a G&G GR15 Raider with our Bull Barrel Silver
• Conversion Kit installed (Also available in BLK)."