The system consists of a bullet-trap tail section which slides over the muzzle of the rifle, an explosive midsection and a front standoff rod. The grenade is propelled by a normal ball or tracer round to a maximum range of thirty meters and is detonated by the impact of the standoff rod against the door to be breached, the standoff distance allowing the blast wave to affect as much of the door surface as possible, negating any need to aim for hinges or locks.
A version which is manually attached to the door is also available, known as "static SIMON".
- Weight: 640 g (including standoff rod)
- Standoff rod: 400 mm
- Overall: 730 mm
- Warhead diameter: 100 mm
- Explosive fill:
- SIMON 150: 150 g 
- SIMON 120: 120 g
- Range: 15 – 30 meters
- United States - A variant of the SIMON 120 is in service with the U.S. Army as the M100 Grenade Rifle Entry Munition (GREM). Changes from the original specification involved fuzing and reliability issues. An inert round, the M101 GREM-Target Practice (GREM-TP) allows training for accuracy without the explosive hazard. The system was given a U.S. Army award as one of the top ten best inventions of 2005.
- "SIMON". Rafael Advanced Defense Systems Ltd.. http://www.rafael.co.il/Marketing/342-1005-en/Marketing.aspx.
- SIMON Brochure
- "M100 Grenade Rifle Entry Munition". Army Magazine. http://www.ausa.org/webpub/DeptArmyMagazine.nsf/byid/TWAH-6ZGR69. [dead link]
- "US Army Awards for Top 10 Inventions of 2005". Defense Industry Daily. June 26, 2006. http://www.defenseindustrydaily.com/us-army-awards-for-top-10-inventions-of-2005-02378/.
- Strategy Page article
- M100 Grenade Rifle Entry Munition(GREM)
- Soldier Armed - M100 Grenade Rifle Entry Munition
- Video of GREM training and soldiers' views of the new weapon - liveleak.com
- Future Weapons video
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