Morisato54 got this short video showing how he built a custom Type 38 Arisaka airsoft rifle. Used from 1906 to 1945 by Imperial Japan, it is a bolt action rifle that was used together with the Type 99 rifle in World War II. If you want one but do not have time to make one for yourself, there is the S&T Type 98 Airsoft Rifle availalbe in the market... "This is a custom built airsoft rifle patterned after the Japanese Type 38 rifle.

Renegade Cow, posting as Morisato54 on YouTube builds Fallout 4 Pipe Rifle Custom Airsoft GBB... "Custom built airsoft gas blowback (GBB) replica of the pipe rifle from Fallout 4. Uses 1911 mags for a functional (shoots bbs) '.45 receiver' upgrade or a mock, side fed, vanilla .38 mag for display/cosplay use. Fires 6mm plastic bbs, semi-automatic at 1.4 Joules."