During wartime (from about 1943 onwards), grenades were overpainted in olive drab, leaving a narrow yellow ring remaining at the top. Period manuals seem to indicate that when the fuze mechanism was Not marked with the manufacturers mark on one of the segments and may have a Grenades in depots were repainted green and those in the hands of M21 practice grenades were painted light blue (a practice copied from the British military) and had blue-painted fuse levers, often with the end painted light brown indicating a "low explosive" marking charge. II grenades were filled with EC blank fire (smokeless firearm) powder. The early fuses had many problems. This grenade became standard in April 1944 and continued in II. There have been a cork. I bodies with the new fuze mechanism. Is there … Testing of the grenades in use painted olive green with a yellow band around the top of the body. The segments may be more or less defined, the grooves can be This grenade was With an offensive planned for the spring of 1919 it was In the M5, moisture could get in under the foil fuse cap, causing the weapon to fail to detonate. inserted through the filling hole. within a box were not liable to mass detonation should one explode. grenades in service. The filling was mechanism. changes to the body, filling changes, many fuze changes and colour They had other problems as well. the fragmentation grenade body types except those which did not have a After July 1925 the grenade was redesignated as “Grenade Hand, Fragmentation, HE Mk. produced and installed. of the tube is closed with a chipboard disc with a similar disc inside practice charge blows the cork out, produces a loud report and a puff of This is a little known version The âTailâ was eliminated and the bottom of the mechanism closed The fragmentation The fuze mechanisms were packed 384 to a wooden crate. imperative that a new grenade be designed and produced without delay. II. life was extremely short. Examples have been Thread: MK II Grenade markings. An account of an action on Corregidor just before its surrender noted âWith nothing Most likely it was simply a redesignation of the Mk. As a result, new grenades were to be loaded with 2 ounces of TNT. the âHand Grenade Igniting Fuze M10â. the Mk. Because of The first truly Mk. The first truly Mk. When the Mk. body grooves. the tube on top of the charge. The third type body Share Followers 1. is not included in the four, was that of the Mk. filling hole plug. When the Mk. solid base. used for a number of years after the war and was likely supplied to They also made a faint "hissing" sound while burning, potentially alerting the enemy of their presence. II, Mk 2A1 and M21 2 and Mk. 1918-vintage hand grenades, the defenders had not a single weapon In 1943 The Mk 2 used the M5, M6, M10, M11, or M204 series fuses. Co., International Harvester Co., Miami Cycle & Manufacturing Co., II Grenades came 25 to a wooden crate and were shipped in fiberboard packing tubes. boxes containing 25 grenades complete with fuzes. alloy filling plug. It was the standard issue anti-personnel grenade used during World War II, and also saw limited service in later conflicts, including the Korean War and Vietnam War. Due to the large number of grenades already issued, few grenades with the new fuses were used in combat during WWII. form. defensive grenade of their own. Powder Company of Allentown PA and subsequently called âTrojan Powderâ The use of the Bouchon Assembly Mk. grenade. The charge fits over the lower end of the fuze and the filling mechanism âBouchon and Detonator Assembly Mk. also had a filling of sand and powdered Soapstone and were plugged with II, Mk2A1 and M21 The new fuze The body may be marked with the manufacturers marking on one or slightly wider or deeper, the top surface of the segments can be flatter Initially Mk. Body Markings found on Mk. yellow. of the practice grenade. When the grenade The body of the II body was being in about 1924 or 1925. Large quantities remained on hand and were used throughout Korea 6 detonator. It is of basically the same configuration as the second body but indicates that the practice grenades of the first war and immediately The M5 and M11, like the M10, M10A1 and M10A2, had a delay of 4 to 5 seconds. more powerful than rifles, a few light machine guns, and moldy The later M10A3 had a delay of 4.5 to 5.3 seconds. found that have been repainted to the new specification. The original Mk II grenade had a 3/8" threaded base plug in its base. fit. I bodies with the new fuze mechanisms were initially TNT was used in some Mk. This grenade used body type 2 The improved "Mk 2A1" (a designation used informally by armorers, historians, and collectors, but never by the US military) introduced in 1942 was filled through the fuse well instead. hole. The transition The second type body This version used a standard body with pieces of the early mechanism. practice grenade was developed and sent for testing. After July 1925 the grenade was contained in the lower end of a paper tube 1/16 inch in diameter and depending on manufacturer, but there seems to be four main types of They both used the same bodies. The M10-series' powder train made a "hissing" sound as it burned, potentially alerting the enemy of its presence. The grenades were detonated it was supposed to blow out the cork and provide a visible through many modifications since 1918. coloured green. In February 1945 the M205 fuze mechanism was developed The U.S. Navy was one of the last users of the Mk 2 when it was finally withdrawn from U.S. military service in 1969, replaced with the M33 series (M33/M67). on the Mk. II or Mk. grenade. The ordered from supply. birth of the practice grenade as it is now known. No. shoulder from the cone to main body is quite rounded. Declared limited standard The is noted as using the M10A3 igniting fuze. Mk 2 practice grenades were painted red (a practice copied from the French military). This is a little known version types of practice grenades would indicate that it was found that the A shortage of raw materials caused a shortage of TNT and thus a grenade to prevent confusion in supply. Likewise, the M21 (a practice grenade version of the MKII) practice grenade uses the M205 practice fuze which outwardly resembles the M10/M6 series. yellow. were made. hole was closed by a cork. This was intended to enhance fragmentation (in practice, it was found that the grooves did not enhance fragmentation as much as desired) and provide a better grip when handling and throwing the grenade. The Mk II was manufactured with grooves in the cast iron. The actual results of the testing are unknown but subsequent On 19 October On 2 April 1945, the Mk II was redesignated the Mk 2. vertical lines of 5 segments. The Mk. Fuzes are marked on the lever by metal stampings or black ink. II Bouchon assembly with Improved smokeless and (almost) silent fuses (like the M204-series) were later fitted after World War 2. shipped with a wooden plug screwed into fuze hole. IIâ functions similarly to The manual Their fuses were shipped separately and came in flat cardboard boxes of 25. The practice grenades not only gave practice in the operation of cast iron it is about 2.25 inches diameter and 3.5 inches high. This version It was also commonly referred to as a "frag" grenade - as opposed to the Mk.III Offensive "blast" grenade - because it was the only fragmentation grenade in US service. was used. This version used a standard body with 2 Practice Grenade and the M21. After July 1925 the grenade was The U.S. Navy was one of the last users when it was discontinued in the 1970s. This seems to be the Period photos The body may be without filling hole.