You might want these Nitro.Vo QD Hole Covers from Laylax if you don't want dirt or mud or any sticky stuff stuck inside the QD holes if not in use. It means less time cleaning your airsoft gun... "This product is a resin cover to prevent sand and dust from entering the inside of the QD hole.

It can be easily installed by simply tightening the center screw and protects unused QD holes.

*This product is an item that adopted the idea from '969' from among those who applied for our project 'Idea Recruitment Grand Prix'!"