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Mr Bulletfeeder Replacement Dropper Ball Bearing Size?

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Lost a ball out of the dropper assembly and took one of the others to local industrial equipment supplier to find some replacements.  When attempting to install the new ones I lost the only remaining original ball.....which wouldn’t have been a problem except the replacements are too large and don’t fit into the die. 


Can someone confirm the ball size is 4mm?


I failed to specify metric upfront so if anyone needs approx. 150  3/16 chrome alloy grade 25 balls send me your address!

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6 hours ago, GregJ said:



 5.56/.223: 6mm ball bearings
- 7.62/.308: 5mm ball bearings
- 9mm/38: 4.5mm ball bearings
- 10mm/0.40: 4.0mm ball bearings
- 0.45: 3.5mm ball bearings



How did I not find that first place I checked was their website 


thanks Greg

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