G: PARATROOPERS’ WEAPONS The standard 7.7mm Type 99 (1939) LMG, which already had a detachable quick-change barrel, was provided with a detachable shoulder stock and hollow forward-folding pistol grip; this model came into use in 1943 (G1, G2). At 46½in long, this weighed 23lb, took 30-round box magazines, and had a rate of fire of 850rpm. Few sub-machine guns were initially used, but larger numbers were issued for the deployments to the Philippines in 1944; although they were not listed on organization tables, a Takachiho paratrooper veteran stated that they had about 100 per regiment. Three versions of the 8mm Type 100 (1940) were employed. The original 1940 version (G3), which already had a detachable barrel, was modified in 1942 with a folding stock and the removal of the flash hider (G4a, 4b); length was 34in, or 22.2in folded; weight, 7½lb; and rate of fire, 450rpm. The much altered 1944 version (G5), without a folding stock, weighed 8½lb, measured 36in, and fired at 850rpm. All used 30-round magazines. The Type 100 bayonet issued with the SMG had an 8in blade (G6). The 5cm Type 89 (1929) grenade discharger (G7) – popularly but mistakenly called a “knee mortar” by Allied troops – weighed 10.3lb; a 1943 paratroop version had a detachable base plate (G8), although the standard model base plate and firing mechanism could already be unscrewed and reversed inside the barrel for compact carrying. This valuable weapon fired HE (G9a) or WP (G9b) shells out to 700yds, and Type 91 (1931) hand grenades fitted with propellant charges (G9c) to 200yds; a range of smoke and pyrotechnic rounds included this 3-star red flare (G9d). The discharger was carried in a canvas case slung from the shoulder, and paratroopers were provided with a chest pack. Some IJA officers carried 3.5cm Taisho Type 10 (1921) flare pistols (G10); the IJN used the 2.8cm Type 97 (1937) (G11). The IJN 17-pocket paratroop bandoleer is shown at (G12).
Rottman, Gordon L.; Takizawa, Akira. Japanese Paratroop Forces of World War II (Elite) (pp. 121-122). Bloomsbury Publishing. Kindle Edition.
Be cool if the Looked more like IJN Special naval landing Force paratroopers as well.