The company UTM (Ultimate Training Munition) out of the UK is selling ammunition to the military in the US and elsewhere. Pepper just indicated that some of their stuff recently received an US type designation.
As this stuff gets more common, some is being cut up. Be careful, these rounds have a second primer up inside the cartridge just about where you would drill or cut. they also have loose bits inside the round.
The second primer is initiated by the steel ball that sits above the lower primer. Note the round on the right (a battlefield blank) has been fired.