JG BAR-10 Feeding Problem After Upgrading

[USP_45]

So I got a JG BAR-10 a few weeks ago and I'm planning to upgrade it to the tits. I have already put in an Angel Custom CNC Hopup chamber with a 590mm 6.01mm tightbore. When I got it the gun fed perfectly, and after the upgrades it fed as well. All of a sudden when I took apart the mag release to lube it, it no longer fed bb's. I tried 2 different mags that were TM brand, but still no feeding. The only time I can get it to feed is when I hold my gun upside down and slap the mag in pretty hard. Any ideas on how to fix this, since chambering a round every time this way is obviously not practical.