7 replies to this topic

[dragnet88]

I just did rawray's xbow mod, and at first it was awesome. It was getting about 90-100 feet consistently, but the only problem was that the barrel was pointed considerably to the right of the gun, which was pretty annoying. So i opened it back up, twisted it around, and stuck some fbr on the sides of the pvc coupler to keep it in line. Now it was perfectly straight, but shooting only 50-60 feet! I guessed that the seal had been broken in the process of straightening the barrel, so i opened it up, and sure enough, the plumber's goop had come undone. So I re-did the entire seal where the pvc coupler meets the plunger tube, covered it with huge amounts of tape, and figured that my problems were solved - alas, still only 50-60 feet. What could the problem be? I don't think it can be the seal, since I have more plumber's goop and tape on there than anyone should need. I don't see what the difference is between the beginning, when my gun was shooting 100 feet, and now, when it's shooting 50 feet. Any ideas?

[navy seal]

I'm quoting Talio on this:

Here's the thing about asking questions on botched mods. I know it sucks because you probably spent alot of time on the thing for it to screw up on you. However, without seeing or shooting the gun it's hard to figure out exactly whats' gone wrong. It could be so many things that listing them all would be impossible, however without proper information here is what I would check.

1. Seal. Make sure when you put the plunger into the tube that it's a smooth action. You don't want it to be too loose and you don't want it to be too tight. You just want a good solid seal. If it's too small, then the problem is obvious, the seal is leaky and not enough air is moving through the barrel consistantly. To fix this, take the plunger and tube to a hardware store and camp out in the O rings section for a god awful long time. Try every one untill you get a good seal. You could also simply rap the head with masking tape, however you'd need to band it then. If the fit is too tight, it's adding more resistance then the spring can handle, making the plunger move too slow. This could be do to a factory problem.

2. Check the spring. If it's a good quality spring that looks long enough and has plenty of resistance, you're in good shape. If it seems like it's small or weak, just add some bands and you'll be set.

3. Check the barrel connection. Are you absolutely certain that the glue point is air tight? Did you use PG on it? I'm a huge advocate of epoxy and super glue, they work wonders. Unfortunetly though, they can leave something to be desired when it comes to barrels. It's the same with X bows. Every person I know that used epoxy for their barrels on the bow have had problems similar to what's happening on your experiencing. Solution - just put a ligth coat of PG around the connection.

4. Banding. From my experience, the NF just likes a good couple of bands rather then a stiff bungee. You might want to try putting a few on and seeing if you have any improvement.

5. Barrel to dart match. This is pretty self explanitory, as stated many time before you want it snug, but so much that you really have to murder the dart to get it in.

6. Barrel length. No two guns are exactly the same. Similar, but it's possible that you might need a shorter barrel. This is absolutely last effort though.

Hope this helps, and now when kids ask this quesiton I can tell them to search.

Talio.

[Talio]

So we're looking at exacts here? Is the barrel exactly the same as you tested it with the first time? Is your barrel clean? Are the darts exactly the same? Did they wear out at all? There are so many factors when it comes to the way guns shoot. That is a considerable drop off, but you should think about taking the entire barrel assembly off and start from scratch. This time be 100% certian it's straight.

Talio.

[dragnet88]

The darts, barrel, and all of the equipment is the exact same as before. The only change is the use of fbr to straighten it out. It is baffling me because of the huge change when I barely did anything to the gun itself

[Kuhlschrank]

Check the plunger. The dropoff might not have been because of the barrel, you might have broken something if you didnt reinforce it well enough, it just might be a coincidence that it happened when you changed the barrel.

[NinjZ]

Check the rubber thing on the plunger. It may have gotten squished down some. Put some tape on it to make it a bit wider ( only a bit, not alot ! ) or just bend it back some. Make sure you use some bands too.

[Suave]

Yeah and re-lube the plunger.

[ompa]

The plunger deformation problem has been plaguing me forever. I just ended up covering the entire plunger in masking tape, so it can't really bend much anymore. It still does work, I'm getting about 95' out of mine.

~ompa