The Pet Bottle Adapter is a simple, yet effective tool that can help you keep your workbench clean while cleaning your rifle.
This adapter is made of durable plastic and is designed to fit snugly over the barrel of your gun. Once the adapter is in place, you can simply screw a plastic bottle onto the adapter. This will create a seal that will keep any chemicals or patches from spilling onto your workbench.
 
You can use a regluar soda & water plastic bottle
 
Features:
Made of durable plastic
Comes in M14, M15 or M18
Works upp to caliber .338 
 
The adapter is also 3D printable for free. You can find the STL files here: https://www.printables.com/model/578661-pet-bottle-adapter