16 replies to this topic

[TantumBull]

Okay, so this afternoon I finally finished my brass'd LS and screwed er up. I took it outside and shot a couple darts with great disappointment. The thing barely hits 50. My breech is completely air tight, I can put my finger on the end of the barrel and fire, and the plunger will stop (this also implies a perfect plunger seal). I'm using the stock spring, a tech 6 spring, and a segment of a stock NF spring (fills the area the T6 spring doesn't). My darts have a perfect airgun fit in 9/16" brass, as in a very loose one, but not so loose that the dart will slide out of the barrel. At first I thought that was the problem, so I went and doubled up on tightening rings. Its now about as hard to load a dart into it as it is into 17/32 brass. This got me a little better results than before. I use mod man foam, but I decided to not use 17/32 brass as the main barrel because my darts have a really tight fit in it, as in I have to twist them in. Has anyone else who has a brass'd LS also have/had similar range problems?

[jwasko]

Mine used to do this. It seems the plunger seal (while good) produced too much friction.

Then I did this and ranges improved by 20 to 30 feet. Still not up to F_A24 standards of perfection (especially the breech...ugh), but it had primary-worthy ranges.

Of course, that will only work if plunger friction is your problem.

Edited by jwasko, 11 February 2009 - 08:06 PM.

[TantumBull]

Mine used to do this. It seems the plunger seal (while good) produced too much friction.

Then I did this and ranges improved by 20 to 30 feet. Still not up to F_A24 standards of perfection (especially the breech...ugh), but it had primary-worthy ranges.

Of course, that will only work if plunger friction is your problem.

I think my plunger head's fine. I actually removed the e-tape I had under the o-ring for that reason, that helped a bit. There's little to no resistance when I slide it with my hands. What was your dart fit in 9/16 like?

[jwasko]

I think it was like a "perfect fit" in 9/16" but fairly snug (you know...good for springers) in the tightening ringed segment of the 9/16."

Perhaps your springs just aren't strong enough. I hear tell Tek 6 springs aren't bad, but that NF spring may be negatively effecting things.

Edited by jwasko, 11 February 2009 - 08:18 PM.

[Draconis]

You might be surprised at how much better the washer seal is. The springs sound a bit weak, though. With a stock breech (no ARs, though), rubber washer plunger head, and a section of AR-15 spring, I get 55-60 feet.

Edited by Draconis, 11 February 2009 - 08:31 PM.

[TantumBull]

Hmm, I'll think about the washer head, but I'm pretty confident my current set-up in that are works. I never thought about the NF spring actually hindering it, I'll have to take that out. Below is a picture of a way too beefy spring I use in my NF's. It probably has similar power to an AR-15 spring.

How much of one do you think I should use? Do I need reinforcements?

Shit, I hope those extra tightening rings haven't hindered the gun. They really grip the dart... Eeh, what am I talking about, I'm sure their fine.

Edited by TantumBull, 11 February 2009 - 08:46 PM.

[rokor]

When I did my PETG breech, I was originally hitting 50ft at most. I had stock and Recon springs in, but when I swapped it to a BBB spring I was hitting 95ft consistentally(with double O-Ring) and sometimes over 110ft. Try putting in a new spring and you'd be suprised what the difference is.

[TantumBull]

Bump for question:

How much of one do you think I should use? Do I need reinforcements?

[TAiLsChaser]

I thought e-tape on my plunger head would help as well but it turned out to stop the plunger halfway with just one wrap. As far as having a brass barrel that doesn't do anything, yeah, I got that. All the extra power comes from the springs and accuracy, the darts. To some extent, unless you manage to get some amazing airflow, (at least personally) I don't think there is much need for it. Ever since I put one in, it shoots probably marginally better but not enough to warrant the effort.

[TantumBull]

As far as having a brass barrel that doesn't do anything

Umm, yes it does. As is already determined, the problem is not enough spring power. You said you put "one" in. Do you mean an AR-15 spring?

Thanks for the reply, though. My above question still stands.

[Forsaken angel24]

Could it be your stefans are weighted too heavily?

[TantumBull]

Could it be your stefans are weighted too heavily?

I don't think so... I thought about that, though. I'm using 3/0 fishing weights. Maybe I'll try out some of my old bb stefans.

[KingBouyah]

FA_24's suggestion was the first thing I thought of as well.

Perhaps you've already done this, but I'd say you should make up a set of differently weighted stefans and test them all.

I have a 2" set that I make. This includes one of each with 1, 2, 3, 4, 5 bb's and then one with 1/4" slingshot ammo. I mark them on the back of the dart with a sharpie as I make them.

Shoot all of them from the same position and then see which gets the best distance as you pick them up. I've found that with spring guns, 3 bb's works the best for me. Anything less fishtails like mad and anything more drops too early.

People say that higher power guns need heavier weights. I won't dispute this for airguns, but even my PETG BBB seems to work best with the 3 bb stefans.

I've never worked with fishing weights, so I can't say how they compare. But it can't hurt to throw those in the mix as well.

[SorrowX]

Brass is very low friction. In order to get really good ranges, the seal needs to be good, and the dart has to be a tight fit. the brass breech in my LS telescopes from a 1/2 in. brass holding section that hold the dart in longer, allowing more pressi\ure to build up, to a 9/16 in. brass main barrel to guide the dart out.

[Zorns Lemma]

Brass is very low friction. In order to get really good ranges, the seal needs to be good, and the dart has to be a tight fit. the brass breech in my LS telescopes from a 1/2 in. brass holding section that hold the dart in longer, allowing more pressi\ure to build up, to a 9/16 in. brass main barrel to guide the dart out.

With tightening rings, that shouldn't be the problem OP is having.

[TantumBull]

I replaced the spring last night and shot a dart down my hallway. The tip flew off. I was more than happy. Till it broke where the sled attaches to the brass. Zap a gap just finished drying, now I'm gonna slather on some JB weld and maybe some epoxy putty. Thanks for the help guys.

[boisie]

A longshot does not actually follow standard springer barrel use, as I've found. I had a breeched 17/32nds and a breeched 1/2" thin wall, and the thinwall was real loose. The 17/32nds was tight. I got 20 extra feet (88ft average) with the PETG and an NF spring, compared to about 70 for 17/32nds and an NF spring.