Can I use Airsoft BB's in my BB Pistol? I would have to say this is by far the number one question I get asked in the comments section of my YouTube videos. I have made several videos where this question gets addressed within the video but so far to date I have not made a stand alone video just covering Airsoft BB use in BB Guns.
So here it is, and now I have a video I can link to this so very common question, if you where wondering about this yourself than please watch my YouTube Video on this topic as it goes into a fair amount of detail about it.
The short answer to this question is no, you can not use 6mm Airsoft BB's in a 4.5mm Steel BB Pistol or Rifle. For the simple reason that 6mm is larger than 4.5mm and so the physical diameter of a6mm Plastic Airsoft BB is just to large to fit inside of a 4.5mm Steel BB magazine or barrel.
People have commented about using a 4.5mm plastic Airsoft BB in a 4.5mm BB gun and yes this could in theory be an option but I discuss why I feel this is not a good idea based on size and mass.