I have a basic M4 patrol rifle built by Spartan Arms of Georgia. I had several of these built a year or so ago, and need to make a little room in the safe. DTI T-Marked upper, Yankee Hill lower, milspec BCG, 16" chrome lined barrel, A2 flashider, A2 front post, YHM removeable rear site. Rifle was test fired at the factory only. Will take $950 or might possibly trade for another 1911.