Not BMDM, but i have transfected macrophage cell line (murine RAW 264.7) and human primary macrophages using LONZA X-kit and Y-kit respectively. The system is called Amaxa 4D Nucleofection kit. They work pretty good for us. You can google it and give it a read.
for transfection of plasmids in primary macrophages I use a new transfection reagent called Viromer RED.
Its a synthetic polymer zero in charge. Due to an active endosome escape mechanism I get higher transfection efficiency compared to standard reagents. Please find some data attached.
Feel free to contact me in case of further questions: [email protected]