M26 grenade

The M26A1 is an M26 that has the fragmentation coil redesigned to have a square rather than circular cross-section and has deeper serrations to aid in fragmentation. It also added a small tetryl booster charge on its fuze to completely detonate the explosive filler (displaced to 5.5 ounces because of the added booster charge) and used the updated M204A2 fuze.[3] It was adopted in American service in 1958.

The M26A2 is an M26A1 modified to accept an M217 impact fuze.[3] It is slightly fatter than the M26A1 and the safety lever is embossed with the word "IMPACT" on it. Earlier models had a red-painted lever with the word "IMPACT" painted on with black paint[5].

The M30 is the practice version of the M26 grenade. It had a cast-iron two-piece oval body with a plastic base plug. The body was embossed with the symbols "RFX55"; it was originally the basis for an experimental hand grenade that was never put into production. It had a filler of 21 grains of black powder and used the M10A3/M10A4 or M204A1/M204A2 series of fuzes. Its body is painted light blue with a brown band across the middle. When the grenade detonated, the overpressure made the plug pop out and released a plume of black smoke caused by the burnt filler.

M61 showing the additional safety clip

The M61 is the M26A1 with an extra safety (called the "jungle clip") attached to the safety lever. This is to prevent the safety lever from flying off and allowing the striker to function if the safety pin gets accidentally pulled out by snagging it on jungle vegetation.[4]

The most common method of carrying grenades was by straps on the ammo pouches. Soldiers, inspired by characters in movies and TV shows, also commonly hung grenades on their persons using the safety levers, although it is said that "official policy forbade the practice as unsafe."

The M62 is the practice version of the M26A1 / M61, but with a larger 5/8-inch fuze well. It has a filler of 37.5 grains of black powder and uses the M228 fuze. Its body and lever are painted blue to identify it as a practice grenade and it has a "jungle clip" like the M61.

The M50 was a "live fire" conversion of the M30 Practice grenade for use on training ranges. It sealed the base plug, used the M204A1 fuze, and replaced the low-explosive black powder filler with high-explosive Composition B. It allowed the training of recruits with greater safety because it lacked the fragmentation coil of the M26 and had a smaller blast radius. This also used up obsolete ordnance by utilizing worn M30 bodies as its base.

The M56 is the M26A1 with a larger 5/8-inch fuze well. It uses the M215 detonating fuse (with a delay of 4–5 seconds) and has a "jungle clip" like the M61. The M215 is similar to the M213 fuse used in the M33-series grenades except it has a curved lever rather than the bent straight lever of the M213.

The M57 is the M26A2 with a "jungle clip" safety attached to the lever.

A British L2-A2 fragmentation grenade

The L2 series (with a green shell) is the British version of the M26; it has a 4.4 second fuze. The L2 was like the early M26 (except it used the L25 series fuze), the L2A1 was like the product-improved M26A1, and the L2A2 was a variant of the L2A1 with a redesigned fuze well for ease of mass production.[6]
The L3 series (with a light blue shell and a black powder filler) is the Practice grenade variant.[6][7]
The L4 series (with a dark blue shell, non-functional fuze, and no filler) is the inert Drill grenade variant.[6][7]