Magazine problem

[Haniball1337]

Hi guys , Happy New Year . As always i have problem... I just started building a 4,5 mm BB Semi auto Airgun , but the magazine doesnt work that i wanted. QEV is piloted by 1/8, 5/2 solenoid valve converted into 3/2 NO. Magazine is gravity feed (with spring the same happens) and detent is a magnet that is holding bb in barrel. It is just normal tee. I tested it and when i shoot it shoots 1 bb or sometimes it shoots 2 bbs or often one bb is shooted and after that, another 2 bb are blown, just dropping of the barrel. Magazine tube is the same ID as barrel (4,5mm) What do you guys think is the problem?
Images

https://zapodaj.net/51c77b74bda28.jpg.html
https://zapodaj.net/0776da9004655.jpg.html
https://zapodaj.net/4517946765b0a.jpg.html <-------- Magnet on top magazine
https://zapodaj.net/d6bdb428060be.jpg.html <-------- 1/2 chamber
https://zapodaj.net/1daff0927d9b1.jpg.html
https://zapodaj.net/db9571a420cb7.jpg.html
https://zapodaj.net/e71c0b61765aa.jpg.html <--------- Magnet holding bb ready to fire
https://zapodaj.net/d08d9d1f3183a.jpg.html <--------- Barrel inside aluminum tube
https://zapodaj.net/411e0d22f7fce.jpg.html

[farcticox1]

I have tried similar and it will always happen like that, there is too much air just to launch one BB, it will try to launch the next one or two at a reduced velocity, so they just roll down the barrel. If you want semi auto you need to block the magazine tube somehow between each shot, that's the tricky bit. I did it with a seperate loading piston viewtopic.php?f=29&t=26692

[jrrdw]

I have tried similar and it will always happen like that, there is too much air just to launch one BB, it will try to launch the next one or two at a reduced velocity, so they just roll down the barrel. If you want semi auto you need to block the magazine tube somehow between each shot, that's the tricky bit. I did it with a seperate loading piston viewtopic.php?f=29&t=26692

I would incorporate a inline paddle wheel of sorts with the partitions just big enough for one BB at a time. Use a external adjustment to control the ROF. This would be replacing one mechanism for another but you would gain on the fly tuning, downsize the over all size. Just off the top of my head, probably has been done before...

[Haniball1337]

I have tried similar and it will always happen like that, there is too much air just to launch one BB, it will try to launch the next one or two at a reduced velocity, so they just roll down the barrel. If you want semi auto you need to block the magazine tube somehow between each shot, that's the tricky bit. I did it with a seperate loading piston viewtopic.php?f=29&t=26692

So there is no chance of magazine with magnet detent working reliably?

[Haniball1337]

What if i will remove magnet detent and I will make ball detent?