Ever wanted to have a recoil effect on your existing M4 AEG without buying a new one? Modify has the answer for that and you can get one at Airsoft World for £69.95. Two demos and installation videos are provided below... "So, you want your AEG to be a little more realistic do you? We'll try this! Brand new from Modify comes the M4 Tremors kit, adding realistic kick to each and every shot! Using an ingenious array of springs, weights and custom parts, your M4 will recoil in your hands like never before!

However be aware that you will need to strip your M4 gearbox out to fit this and that it will not work with rear wired AEGs as it sits within the stock tube."