Yes
The rounds arm themselves after about 18 to 36 meters.
IIRC the M918 TP (Target Practice) rounds arm in 18 meters, while the M383 HE (High Explosive), and the M430 HEDP (High Explosive - Dual Purpose) arm in 36.
The HE and HEDP have a kill radius of 5 meters and can wound out to 15 meters
The max range is 2,212 meters against area targets, with an effective range against point targets being 1,500.
The Mk-19 Mod 3 was my baby when I was in 2nd ACR. The serial number of mine was 2700.
When I went through Ft Knox a long time ago, there was a story of a DAP (Dumb A$$ Private) who upon return from the range was tossing a HE round up in the air and proceeded to scatter himself to the four points of the compass.
Wow! Thanks for that detailed reply!