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Discussion starter · #23 ·
Alright, I just glanced, my engineering teacher let me on during class. Anyways, I see the pictures. Only parts i'm confused on is the small o ring, is there a certain depth? And, I'm thinking about how I want to adjust the hopup. My BB's were diving previously, could that be a hopup issue?
 
#24 ·
If the bbs are diving, it could be because of a couple problems. From what you have described it is probably due to the o ring coming out during it, but here are some other things to make sure of.

1. The bucking has to be aligned a certain way. It cannot just be placed on the barrel and then attached to the chamber. There should be a small slit along the bucking that needs to align with a slit in the barrel. When placing the barrel/bucking onto the chamber, the small protrusion on the inside of the bucking must be placed up facing the small open gap in the PDI chamber. This is where the nubbin goes over top, and the arms put pressure down on the nubbin.

If this is not done correctly, the bb's, when fired, will result in massive HOP DOWN. Even when you adjust the hop up screws for more hop, it will do nothing. Instead, dry firing and low hop shots will result.

It is hard for me to describe the small o ring installation, but I figured it out by reading through this one post will relatively good pictures. There was a method involving the end of a colored pencil (unsharpened side) to keep the o ring from sliding around, while using an allen wrench to fit the o rings in the grooves (inside the chamber).

Here is the link: http://www.airsoftforum.com/board/lofiversion/index.php/t102401.html
 
#26 ·
Hi, I had the same problem when I first installed my PDI hop-up in my ASR. For me, it was that the barrel was sliding out of the hop up chamber when I fired because the hex screws toward the muzzle end of the barrel were not screwed in enough. Whenever the bb hit the bucking, the barrel slid out and the bb got messed up. It was curving down a lot, and made the same sound you're describing. After you replace the O-rings, try making sure the screws are tight, and I even put some tape around the end of it so it couldn't move. This solved my problem nice and quick.
 
Discussion starter · #30 ·
Basically, what I did was, I installed the small O ring correctly.
Then, I changed the large O ring to a rubber band. Credit to Fuzzy for this.
I installed the hopup screws correctly this time around.
I made sure I tightened the larger hex screws near the barrel end of the houp. Make sure you tighten them so your barrel doesn't move.
Also - Lubing it is a good idea. I can write a guide if you wish. :)
 
#34 ·
Possibly a torn bucking. When you said you fixed it, were your shots having good hop (shots going relatively far)? If so, then the bucking is most likely not out of place, but ripped or torn. Could also be a nubbin problem. Or your rubber band (one that replaced the large o ring broke).
 
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