For sale Conversion for Sig MPX pistol to rifle. Factory Sig MPX 9mm carbine barrel ($797.00), Lancer 16" carbon fiber hand guard ($430.00), and Factory Sig collapsible butt stock ($299.00). For sale $1,000.00 OBO. Taken off my MPX, original owner. Excellent condition. Everything you need to convert your MPX pistol to a rifle. Cash only and selling all parts together. ID and BOS required. I live in La Grange but am in Austin occasionally. Text 979-966 9044.