Worker W0638 Bearing Slider - Harrier & Seagull

Yes the Harrier and seagull have a nice prime already. But... Bearings can't hurt right? 

The base version - has an POM body, and Nylon bearings. 

But we also have another version - that comes as above - but also includes steel bearings (you'll have to press out pins and replace). Little harder on your barrel anodizing, but may work for you.