Review on Efficient Astro GF14C: 0.6L Plastic Gravity Feed Cup for Optimal Painting Results by David Sanchez

Many popular brand guns come with metal cups that bend easily and the lids could just slam shut and break off without warning. That's why I use them on guns that use internally threaded cups. They are not deformed, and the lids are tightly twisted. And this brand is better than most other cheap brands. If you can find such plastic cups from well-known brands, they will cost you 3 to 4 times as much.