Air-burst 40x53mm HV cartridge grenades and integrated FCS-fuzesetters are already available for several types of 40xmm AGLs.

A recent report claims the USMC is seeking air-burst capability for its 40mm UGLs and MGLs: see http://www.military.com/news/article...st-weapon.html

During the last few years Germany, Israel, Singapore and South Africa have each been rumoured to be developing FCS-fuzesetters or sights with dial-in fuzesetters for air-burst 40x51mm MV and also for 40x46mm LV cartridge grenades. So candidate systems for USMC evaluation could include several of these.