Grenades have the disadvantage of having to be thrown, which means you need a guy standing close to a wall, which is why you don't want penetration. FIBUA has

Grenades have the disadvantage of having to be thrown, which means you need a guy standing close to a wall, which is why you don't want penetration. FIBUA has the unfortunate tendency to produce a good number of casualties because of the requirement to get close. Anything that increases standoff range therefore, can reduce casualties. Using something like this, you could "clear" a house one room at a time without actually setting foot in it. Use three or four in quick succession for each room. Even though you'd still need occupation via human to ultimately be victorious, the need to avoid the initial assault into prepared defenses will be a godsend.