Want to Buy DPM Receiver Sections/Set

im wanting to buy a set of reciever sections or individual pieces that are preferably a saw cut or some way reweldable. im wanting to see what sets and what parts are out there. im needing more of the barrel and lug section rather than the rear and i believe the dp28s and 27s are the exact same up front so they could be that. looking for one preferably where the cut is similar to the photo or bigger in the front section. preferring polish parts