Another option in getting tracer BBs for airsoft. Nimrod Tactical got their own line of tracer BBs in 0.20g, 0.25g, 0.28g, and 0.30g weights. All are biodegradable BBs in case you prefer keeping green... "Nimrod Tactical Performance Tracer Airsoft BBs - Perfect polished & free of seams and surface distortions. Performance matters."