AFTE Store - GRC for a Unique Personal Weapon – the M203 Grenade Launcher

The General Rifling Characteristics (GRC), of the M203 grenade launcher (6/R/3.9-4.2mm {0.153″ – 0.165″}), have been measured and are given for future use by firearms examiners. Even though it does not fall under the definition of a “small arm”, the fact it is operated as a personal weapon and is used in a civilian environment, makes this data very valuable. The measurements have been taken after a search of technical literature did not reveal any information about the width of the lands and grooves of this weapon.