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Check that the nub is in there, most cases people lose the little squishy nub that puts pressure on the top of the BB to give it the backspin. Alternately, you could have a feeding problem.
 

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Another possibility is that your bucking is damaged. The portion that holds the bb could be worn out from a lot of use. If you can, try taking it out and check for any damage/ware. You can also take the bucking(once taken out) and put it so the part that holds the bb is facing up. Then take a bb and place it on the top. It should sit on top and not fall inside.
 

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If it's the bucking, and it's a stock hop up, go to pyramydair.com, they have the UTG stock bucking and hop up unit, you can get it for about $15+shipping, and if you sign up for their newsletter, they send 10% off codes out every week.

I've never had this problem with my UTG, so I'm not entirely sure what it could be. Those guys up there^^^ have the right suggestions though. Also make sure the plastic nub part on the adjustment arms isn't broken off or anything.
 

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Discussion Starter · #6 · (Edited)
Check that the nub is in there, most cases people lose the little squishy nub that puts pressure on the top of the BB to give it the backspin. Alternately, you could have a feeding problem.
It seems as if I've lost the squishy nub on the adjustment arm. It's just black plastic and shaped somewhat like shallow "V". Would I have to buy a whole new hop-up to replace this or is it a specific part?

EDIT: Could I use the Madbull Shark buckings + the fishbone spacers? Also, what do the different degrees mean on them?
 

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You can fashion your own nub very easily by using Cheese Man's wonderful trick. Get a nerf dart, and cut a piece of foam off of it, maybe 10mm x 10mm long x 20 mm thick APPROXIMATELY. What I did was glue the foam to the hop up arm. That will put an even amount of pressure on the top of the bucking to provide for a more CONSISTENT backspin on the bb. This will in turn also give you better accuracy overall.
 

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Discussion Starter · #8 ·
You can fashion your own nub very easily by using Cheese Man's wonderful trick. Get a nerf dart, and cut a piece of foam off of it, maybe 10mm x 10mm long x 20 mm thick APPROXIMATELY. What I did was glue the foam to the hop up arm. That will put an even amount of pressure on the top of the bucking to provide for a more CONSISTENT backspin on the bb. This will in turn also give you better accuracy overall.
Would any foam work? I think I still have some fairly stiff packing foam I could possibly use. I'll just have to find something to measure in millimeters around the house haha.
 

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I installed a threaded tip on my kjw m700 ..it was kina tight so i twisted it in ...then when I tried to fire it bbs would role down the barrel ...found out the flashhider O rings the kept it tight around the inner barrel were actually tight enough to turn the inner barrel so I had no hop and the nub wasn't engaging.
 
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