Are you able to dismantle the set up and try the blaster singled with the same diameter brass? It seems like you can remove the PVC part and single it.
If your darts are too loose, it could be a problem, although tightening rings can offset it. However yours seem really tight as you describe them. Can you fashion a new barrel with not-so-tight rings? If you're getting solid ranges from that you can cross it off the list. Maybe try adding 4" of dead space in it too, to see what the maximum can be.
How long is your barrel, too? By "-The dart travels about 9" in the barrel", does that mean the dart moves 9 inches down then exits? Or sometimes does it not shoot? I haven't used brass, but would you be able to make a barrel attachment with some 19/32" (or something to act as a coupler between two pieces of your 9/16" barrel) to add an inch or two to the barrel and try it like that? With brass it seems you should be able to get a smooth enough, close enough connection to try a longer barrel by adding a little bit via a coupler. It would be harder to check shorter barrels, but maybe if you have a ton of spare brass.
From what you describe, it has to be something with the darts/barrel/clip. Silly question, but is the clip air tight? Are you losing some of the power there? Again, I haven't used an n-strike clip in anything other than a stock LS in an indoor war, but you may be losing air to it, not sure.
Hope that helps, it's a nicely done mod, nice write up too.
Edit: Forgot to remove the quotes I used as a reference.
I cannot remove the clip assembly, but I know for a fact that it's air tight. The dart travels 9" total before exiting the barrel. I do have spare brass on hand so I may try doing less tight tightening rings. I think for now what I'll do is make a new barrel without any tightening rings and then nest different lengths of 17/32 brass in the barrel. And thank you.
If your getting low ranges, do what most noobs do... shoot it angled and people will worship you by the 195' ranges your achiving. Except noobs don't get worshipped...
On Topic: I have to agree with slug 4" of dead space is too much, which could and probably is the problem. It also
seems that your plunger tube is messed up especially if it's acting like a crossbow and maintaining a good seal at the front of the plunger tube and terrible seal at the rear. May I suggest replacing the plunger head with a neoprene rubber washer? That's about all I can contribute at the moment.
I'll come back to my RSCB comparison again. 4" of deadspace is nothing. The deadspace in 4" of that size of brass is only a tad bit more deadspace then there is in the elbow and tee part of an RSCB, not to mention the holder section when the clip is empty. Once again, if Zeke can hit 60 on an empty clip with the stock spring, something is wrong here. I think I'll try some e-tape under the o-rings for now to see if it will help with the seal issue. But I may eventually switch to a rubber washer.
Don't know how relevant this is, but you've also added a notable amount of weight on the plunger head and the plunger rod via the epoxy putty and brass that you used as reinforcement. While I'm sure that this isn't necessarily the deal-breaker here (and that you really did a nice job reinforcing that thing), it is considerable weight to add for a part like the plunger head and rod. Not saying I'm 100% correct, but perhaps a point to consider.
Yes, that's very relavant. You're very right that this detracts from range, because the plunger ius considerably heavier now. But your also right that this shouldn't affect ranges as much as it is right now.
That little weight would not make a difference because it's so minimal and he added springs, so the added weight would not affect the ranges.
As I said, it actually does make a difference. He has a valid point.
I would try to temporarily single it just to see if the problem is in the breech, if this is not an option then I'd just blow on the barrel to see if there are any leaks, etc.
Yada Yada single it yada yada
I can't single it. And there aren't any leaks from the breech or the plunger head until it moves farther down the tube.
Thanks for all the help guys. I'm beginning to see that my problem with ranges is a collaboration of many different things. Mainly not enough springs to offset the weight of the new plunger, the "crossbow plunger effect", and dart fit. First I'm going to try adding some springs and improving the seal. If that doesn't fix the problem I'll start re-testing with tighter and looser barrels.
Edited by TantumBull, 09 July 2009 - 04:36 PM.