The white MA logo is MECAR as I recall. It took many years and tears for the military to finally sink in that you'\d never get enough dynamite into a 556 cartridge to hurl an effective rifle anti-vehicle or AP frag grenade a useful distance. The same knowledge would have also come from a 2nd year school physics student for free. After that they extended the efforts by firing a live bullet into a bullet trap grenade - with spectacular results. Alas, not spectacular for several firers including one of my friends, an SASC Major, who was demonstrating one when it exploded on the end of the rifle. Nor indeed to several of the observers as I understand.

Best stick to UGL's I say. If it ainlt broke, don't fix it