Available in different lengths, the Cybergun Colt Elite Line M4 AEG Series is in stock at Evike.com and here is their take on the series... "Patterned after the original ArmaLite AR-15, Colt rifles have been in the hands of the US Military as well as many civilian enthusiasts since the adoption of the M16 combat rifle. Through years of hard use and first hand feedback to improve and evolve the weapon platform, the Colt M4 and M16 has risen to be one of the most popular and trusted combat rifles around the world."