Available for years now, Thor Airsoft checks the Noveske KX3 Amplifier to find out if it does what it is claimed that it does... "Picked up a Noveske KX3 Amplifier that I am eventually going to put on my M249 but wanted to test it out and see how it sounded on my M4. Not a huge difference that I can tell but we will see how it sounds downrange and on the 249 soon."