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The cheapest -/+0.01mm BBs

Im trying it with the green first. Ive shaved off the ridge and hump, slight trimmed the nub to suit the window. Put it all together and its not firing as i 100000% expected to happen. ive also noticed somewhere along the line ive lost the hop sring the pushes the unit back against the gearbox so I thought maybe the mag / feed tube alinement was out, but upside down and manually loading a bb with teezers, it still doesn't fire. the bucking lips dont seem to be pretruding into the feed tube and pinching the bb so i dont know whats going on.
That spring is very important it pushes your hop on to the air nozzle, if its not doing that then you will have issues. Find the spring or you can try packing it out to test but you definitely need a spring to use it properly.
 
Ive found the problem. On the final mm of feed tube right before the bb would enter the chamber, was the tiniest of metal shavings pretruding out and pinching the bb.

 
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Ive fitted it without the spring for now, i will have to get a new one as i think i lost it last time i took it apart just never noticed so its long gone now, but there doesnt seem to be any play in the hop unit with out it, even applying slight forward pressure with my finger from in the mag well, it wont go forward at all. But like i say ill order a new one if i can find it.

 
Ive found the problem. On the final mm of feed tube right before the bb would enter the chamber, was the tiniest of metal shavings pretruding out and pinching the bb.

so if purchasing a cnc'd hop unit, you may have to do some post maching filing to get it to work.
You shouldn't have to do anything other than fit it. Thats some piss poor quality control.

 
Yeah exactly mate, anyone looking at that would have thrown it in the defected bin, i only missed it on the initial assembly because i didnt even think of it. just assumed 'cos its been cnc'd it would be perfect

 
Wont let me upload a picture from my phone

 
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