I think I have the solution to the feeding problem. Works with standard milkies too. (Note that I have put a aluminium barrel (cut down from a bent JM Gen 9 M4 barrel) inside the stainless barrel. This means my bore is a little tighter than the original so there is no loss of FPS with the smaller milky gels. Still works really well with the larger orange and blues, but I don’t running heaps of different gels. AliExpress has a ‘Metal accurate barrel for SKD Glock’ going for $18 bucks to save you the work, but I haven’t tested that barrel. The stainless barrel with the 3D printed inbuilt hop-up is pretty rubbish for accuracy and FPS and your probably better off sticking with the original barrel if you don’t mind using the oranges or blues.
So a short explanation will help you understand the solution: As the slide is pulled back the air nozzle on the front of the cylinder is pulled back from the chamber of the barrel giving clearance for the gels to feed up from the magazine. I found by stretching the slide return spring, the one that goes over the barrel, will return the slide faster, closing off the feed tube quicker, preventing multiple feeds and your barrel clogging up. This means you get more consistent FPS per shot resulting in greater accuracy. Low Guido on YouTube has a great video on the G18 and goes over how to tear it down and reassemble (it’s pretty simple and needs only a screw driver.) Even with milkies I’m getting consistent single gel shots.
Low Guido’s Chop Shop https://youtu.be/tqY36B0liFs
I’m not exactly sure how far I stretched the spring from the original size so I’ve included a pic with the ruler as a reference (stretched to 96mm.) I did also put a spacer on the plunger spring to give it a bit more kick. The gears have held up fine over the past few months of use, but I do expect them to wear at a slightly increased rate. I’m not worried as replacing the gears and plunger/cylinder are fairly cheap.The plunger/cylinder goes for $2.49 off AliExpress and the gears for $8.00 from x-forcetactical.com
Hope this helps,
Feel free to hit me up with any questions.