Something fun for you to watch and probably want to own. Mach Sakai shows the Craft Apple Works M3 Grease Gun Cap Gun that fires plug fire cartridges making it look like you are firing a real Grease Gun. With the realistic firing, you will see the blowback operation. Looks really fun, isn't it? Just imagine the Hacksaw Ridge scene where Desmond Doss (Andrew Garfield) drags an injured Sgt.
This CAW M3A1 Grease Gun Model Cap SMG which is available at eHobby Asia for US$415.00 looks really fun to shoot. Not really skirmishable but can be a good prop gun and it is made of ABS and Metal Construction. It has a realistic shooting action with blowback, shell ejection and muzzle smoke which cap guns are known more. This a hard to find item and collectors will need to act quickly to own one of these.
Not exactly an airsoft gun this time but it's something fun to shoot. Mach Sakai reviews the Tanaka Works P226 Railed Frame Model Cap Gun. This is a blowback cap gun which means it has some sparks or flames to simulate a firearm being fired and is also shell ejecting with the Realistic Bullet Type Cartridge X which is similar to the X-Cartridge 8mm airoft pistol series from Tanaka though the former doesn't fire any BBs.