Hi Derek:
The most current mmbers of that family are the M109A4 overhauled in the USofA and the M109A4+ overhauled in Holland. The spotting diffrence is the Leopard style smoke grenade dischargers on the A4+.
Currently they are sitting in mothballs as we debate our future artillery systems. Canada was the first nation to field the M777 in battle and we now have some 24 of them.
The advances in projectile technology are staggering and the Gunners in the sandbox have some esoteric stuff available to them. Opsec!
Ubique! Mike