This is a Spikes Tactical ST15, this model features a 14.5" 1/7 twist M4 barrel with Spikes Dynacomp pinned for a 16.1" overall length. Spikes full auto spider marked Bolt Carrier Group and heavy buffer, this model has further been upgraded with a full Magpul MOE package including the MOE handguards with a Magpul forward grip, MOE + pistol grip, and fliip up rear Gen 2 Magpul BUIS. This is as tight of a little package as you will find anywhere! I will include a couple mags to the buyer as well.. text is quickest, 210-624-1590, priced to sell at $1075 for the whole package! --- NO lowball offers