7 replies to this topic

[evoion44]

Yes, the acronym is kind of weird.

This is my first homemade, so i'm kind of pondering building it. Basically, its a reverse plunger homemade, and its singled.
Mk. 1 will use a recon spring, or an OMW upgrade
spring (6 kg). I hope to build this in the future, but right now my parents arent letting me build anything nerf-related.
So here's the gun.

http://i1056.photobu...44/0cc13491.jpg

The trigger mechanism (its just a clothespin trigger) isnt on there. I dont know how to draw that.
You pull back on the cpvc "t" (the little circle) and it opens the bolt. Then you open the jam door, place
a dart inside, close the bolt (which also closes the jam door) and fire!. Its like that singled recon that i really want
to build thats on instructables [how to single a recon]. I just used that concept,
and applied it to homemades. I'll have better pictures when i can build it.

BLARPER stands for

Breech
Loaded
And
Reverse
Plunger
Evolved
Rifle

The term "evolved" here dosen't mean its any better than the homemades we have,
it just simply means that I, Evo, have made it. The reverse plunger is sealed by etape, and is going to
be lubricated by OMW silicone grease.

Feedback, ideas, and criticism would be appreciated.

USER WAS WARNED FOR THIS POST

Edited by Zorn's Lemma, 24 August 2012 - 10:03 PM.

[Funky Mutha Facko]

nevermind

Edited by Funky Mutha Facko, 24 August 2012 - 06:48 PM.

[evilbunnyo]

So have you made this already or are planning to make it? I like the idea but I don't see the point of making a reverse plunger homemade. To each his own but it would probally be easier to make a direct plunger anyways.

[evoion44]

So have you made this already or are planning to make it? I like the idea but I don't see the point of making a reverse plunger homemade. To each his own but it would probally be easier to make a direct plunger anyways.

Well, I havent made it yet. My parents are all
"anti violence" so they probably wont let be build for a while... unless i beg on
my knees. Anyway, i havent made it. I need to get my materials.
And the reverse plunger is to make it easier on myself with the breach.
Its bolt-action, so reverse plunger just would seem a little easier
in terms of materials.

[Meaker VI]

Basically, its a reverse plunger homemade, and its singled.

It seems like you've got an over-complex design for something that is trying hard not to be something that is actually really easy to build. If you want a single-shot blaster, don't use a breach, just put a barrel/coupler on there; but really an RSCB is easy to build and has great performance. Switch to a direct plunger, reverse plungers aren't worth experimenting with unless you really know what you're doing. Build a SNAP, and slap an RSCB on there and you've got a multi-shot blaster with better performance for less work. I don't know how the OMW spring compares to the McMaster [k25]/26/36" long equivalents, but you should be able to get McMaster springs if you're in the US and you're buying stuff online anyway.

[evoion44]

It seems like you've got an over-complex design for something that is trying hard not to be something that is actually really easy to build. If you want a single-shot blaster, don't use a breach, just put a barrel/coupler on there; but really an RSCB is easy to build and has great performance. Switch to a direct plunger, reverse plungers aren't worth experimenting with unless you really know what you're doing. Build a SNAP, and slap an RSCB on there and you've got a multi-shot blaster with better performance for less work. I don't know how the OMW spring compares to the McMaster [k25]/26/36" long equivalents, but you should be able to get McMaster springs if you're in the US and you're buying stuff online anyway.

Well, I've tried to build a snap carbine before
and i had to build the plunger and plunger rod a couple of times.
They never worked. So i kind of ruled out direct plungers. The reverse plunger
sealed with etape is kind of an easy way around that for me. And i have some springs from McMaster,
I accidentally ordered them twice and got ten. So I might consider making a SNAP with an RSCB like
you said. But the plunger seal is difficult. I might consider doing a rainbow or something like that.
Thanks for the ideas!

[Carbon]

First, a note: generally, NH doesn't go for "this is my design" types of threads. I understand the position you're in with your parents, though. It may be worth telling them that Nerf has more in common with a game of tag than anything "gun" related - plus there's problem solving and engineering training, to boot.

Anyway...

You pull back on the cpvc "t" (the little circle) and it opens the bolt. Then you open the jam door, place
a dart inside, close the bolt (which also closes the jam door) and fire!

The problem with a design like this (where the breech is tied to the priming stroke) is that the two actions have different distance requirements. A breech needs a maximum of three inches, while a plunger stroke is easily twice that.

The reverse plunger is sealed by etape, and is going to
be lubricated by OMW silicone grease.

I'd strongly advise against it. Etape plunger seals are horribly inefficient, and tend to gum up after a short period of time.

Well, I've tried to build a snap carbine before
and i had to build the plunger and plunger rod a couple of times.
They never worked. So i kind of ruled out direct plungers.

I'd recommend building a standard pullback SNAP before "ruling out direct plungers". Like Meaker said, reverse plungers are fun, but not probably something you want to get into for your first design. Try something basic and simple for your first time, and build up from there. Basic SNAP plunger seals aren't difficult: it's a 1.5" rubber fender washer bolted to a .75" endcap.

Edited by Carbon, 24 August 2012 - 08:14 PM.

[Zorns Lemma]

From the New Members Guide:
DO NOT Post a concept thread. If you have a great idea, try it out yourself first and let us know how it goes. Unless you have something concrete to show us, keep it to yourself. (active build logs, work-in-progress threads etc all fall under this category)

Build the blaster first and then ask for feedback, or, as some other members have, build the blaster until you run into problems, then ask for help.

The merits of an imaginary blaster are a lost cause.

Edited by Zorn's Lemma, 24 August 2012 - 10:04 PM.