This is a factory built, Bushmaster M4A3, the configuration was changed to that of a "Dissipator" with the longer sight radius and rifle length fore end, and a Yankee Hill Flip up front sight. The 6 position stock was exchanged with a fixed "entry" length stock, (same length of pull as first notch on an adjustable stock) which is a great length of pull even for me, a 6'2" tall with proportionate arm length. Great for dynamic shooting. Shoots great, accurate, fun rifle. EoTech and Irons are "co-witnessed". See pictures at bottom. Aprox 1,500 rounds fired. For $700, Basic Rifle Includes: Yankee Hill flip up front sight, MaTech USGI flip up rear sight (with HD bolt and locking bar) Magpul MOE; Grip, Handguard, and AFG Ambi safety Kydex mag pouch 2 Mags Super cool "urban camo" BADminton case (emphasis on "BAD"), complete with $2.99 Goodwill price tag! Or, for $1400, get the package deal of above rifle and the following accessories Surefire M951 rail mounted light with 225 Lumen LED, remote switch, and lens cover. EoTech 512 750 rounds of Factory Reload XM855/SS109 "green tip" ammo (WOW, does it penetrate!) from tacticalammunition.com 8-30 rd Pmags OR 8-30 rd USGI mags (with new springs and magpul followers) Will entertain offers of trades with a minimum of $1000 cash.