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2957 Views 39 Replies 5 Participants Last post by  hoggie
Okay, i'm installing my PDI. Everything goes smoothly.
First the BBs are powering down. Second time, I go back, and the BB jams, tearing a small piece of my bucking off around the end that comes off the barrel, and ripping my smallest O ring in half.
This really sucks, and i'm confused. Is anyone willing to let me ship them my gun or tell me what/how to fix it?

This is an ECHO 1 ASR
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It sounds like the bucking might have been installed incorrectly. When you say bb's are powering down, do you mean there is no hop? Please elaborate, as I encountered many PDI hop up problems, and any details will help me help you.

Not sure about the small o ring ripping in half. All I can think of is if you did not get it installed completely/correctly, resulting in the bb, when fired, to slam against the o ring, causing the o ring to rip.

I would suggest getting your hands on a PDI repair kit, as it will supply you with spare o rings. And try not to get too frustrated. I know the feeling, and I had to get my hands on a few repair kits as well. Took some time before I figured everything out.
Did any bbs make it out of the barrel? What kind of noise did it make? Different than the norm with your rifle?
The repair kit from PDI can be had for around $10 on

The "pffffff" sound you are experiencing could be caused by a couple of things.

1. The bucking was installed incorrectly: The bb will jam and not fire.
2. The nubbin is not installed correctly
3. The o rings are not installed correctly. Most likely the smallest o ring was not, like you said. Hence the reason that it ripped.

Some pics of each step that you did when installing the chamber will help us identify more easily what went wrong.

But like woogie said, take a break. It is frustrating, but worth it in the end my friend. Just resist the urge to throw anything across the room. ;)
Hoggie, did you take a look at the link I sent you via pm? Should have some good pics of the chamber for you.
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:
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Could you let us know how you fixed it? Could help some others out in the future.
Powering down as in no hop, or low fps? Or both?
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).
That is most likely the problem. I recommend guarder softs, G&G softs, and from what I have heard, Systema buckings.
Ok, sounds good. Maybe buy two just in case another one rips.
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