【Billet】Pump-action launcher module (SillyShell)

A pump-action front receiver for Billet，make it a single-shot MegaXL dart launcher OR a SillyShell shotgun pre-mod needed：【Billet】Rear trigger group module 后置扳机组模块 1.Use the SillyShell standard designed by Sillybutts：Silly Shells for Homemade Nerf Blasters 2.Or use a fixed 35mmOD 2mm thick tube(bought or printed) to make it a front-load MegaXL dart launcher 五金增加 Hardwares changes： O型圈 O-ring：OD23 WD1.2 x1 OD19 WD 2 x1 螺纹销 threaded pin：M6*25 x1