This paper model is a full size China Lake Grenade Launcher (or China Lake pump-action grenade launcher), sometimes mistakenly referred to as the "EX-41" or as the "China Lake NATIC", a pump-action grenade launcher that was developed by the Special Projects Division of the China Lake Naval Weapons Center, which provided equipment to Navy SEALs, the papercraft is created by Explosiveman. The size of finished model is about 238 (H) x 48 (W) x 875 (D) mm.
The M79 and XM148 grenade launchers were single-shot, and the repeating T148E1 grenade launcher was unreliable, so a request was made to China Lake engineers. Navy SEAL teams were pleased with the resultant pump-action grenade launcher, since the tubular magazine held three 40x46mm grenades, and so with one grenade in the chamber, four grenades could be fired rapidly before reloading. In fact, a skilled operator could fire four aimed shots before the first one landed. The grenade launcher was extremely light for its size, since a significant portion of it was made of aluminum. Despite this advantage in firepower, it did have limitations as it could not reliably feed the more oddly-shaped 40mm grenades.
The pump-action grenade launcher features leaf iron sights similar to the M79. The front sight is a fixed square notch. Depending on if the leaf is folded or not, the rear square notch is either fixed or adjustable from 75 to 400 m in 25 m increments. Though meant for SEAL teams, a handful were used by Marine Force Recon and Army 5th Special Forces Group. For further information please click here.
You can download this paper model template here: Full Size EX-41 China Lake Grenade Launcher Free Paper Model Download [Box] [Gavitex]