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My Version Of The Scar-n


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#1 ompa

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Posted 22 August 2006 - 01:52 PM

First, I'd like to say Boltsniper's template somehow got messed up, and when I went under preview almost all of the pictures were out of place and/or messed up. I probably could have gone into the HTML coding and fixed it, but I was lazy. Anyways, this is pretty much stuff I copied from the template I used.

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INTRODUCTION
I was annoyed by the moving arms that were present in the NEAR, and did not like
the magazine on the top; a byproduct of the failed tube magazine. As such, I
designed a new gun, using some ideas of my own and some of Boltsniper's, to
create this gun. The goal was to have a long-range gun while keeping it
managable in size. While the range was less than I had expected for having a
massive length of pull of almost over 5", I guess anything over 100' is overkill
in nerf anyways, so I settled with what I had and decided not to go in and do
any serious changes after the first range tests.

SPECIFICATIONS
Description..................Carbine Rifle
Release Date.....................8/22/2006
Caliber..............0.54" (Micro Stefans)
Operation......................Pump-Action
Propulsion..................Spring Plunger
Magazine............Detachable Bottom Feed
Mag Capacity...............8 Micro Stefans
Overall Length.......................28 in
Barrel Length........................14 in
Max Rate of Fire....................60 RPM
Max Range...........................100 ft
Effective Range......................80 ft
Intended Use.......................Primary

DESIGN
IWhen I designed the rifle, I wanted as few moving parts on the outisde of the receiver as possible. As such, I
enclosed everything in a larger-sized pvc than I normally used, which resulted in a receiver body of 1-1/4" pvc. The bolt I had been using in previous guns has always led to a significant amount of air loss; while I had sufficient plunger volume in the previous guns to overcome this air loss, it still bugged me, and took up precious length. As such, I decided to make the jump to the brass bolt that is used on Boltsniper's BS-9, and my MEG pistol. The Magazine itself still uses a simple paperclip to hold the rounds in when not loaded into the gun, but it's a method that works remarkably well. The addition made to the clip is a small spring-loaded lever that attaches it to the bottom of the gun. Previously I had to just rely in friction to get the clip to stay in place. That is now changed, because I decided to get off my lazy ass (laziness being the reason this wasn't done before) and actually make a clip-holding mechanism.The gun itself came out to 28" long. While I had originally planned it to be 26", the additional 2" came from the rear-end of the stock and a small protrusion of the coupler from the front end of the gun, which I had not accounted for
in the original design. Another feat of Boltsniper was his genius trigger design. I made good use of it, and found that it was remarkably easy to make using nothing but a dremel, sandpaper, and a hacksaw. It works great, is easy to maintain, and easy to replace. The magazine is now made of plexiglass and PVC, since balsa just plain sucks for anything that is to be handled roughly.

MATERIALS
PVC and plexiglass is used for pretty much everything:
-1 1/4" SCH 40 PVC
-1" 200 psi PVC
-1" SCH40 PVC Endcaps & Couplers
-1/2" PVC Endcaps & Couplers
-1/2" SCH80 PVC
-1/2" CPVC
-1/2" SCH40 PVC
-O-Rings of Various Sizes (whatever fits best for your batch of PVC)
-Aluminum washer with the same outer diameter as 1/2" SCH40 PVC
-1/8" Plexiglass sheeting
-Music wire of whatever thickness you choose
-Screws galore (varying length, dependent on how deep the screws must go)

COMPONENT DETAIL

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BARREL AND BOLT

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The construction of this part of the gun is probably the most important; there is not much tolerence to work with, and if this part is not strong, then the force of the plunger hitting this area will cause this part of the gun to shatter. As such, there are a total of 3 metal washers and a whole lot of superglue. Basically, the barrel and breech opening are one. The SCH80 pvc I used was able to fit 9/16" brass in it. As such, the breech opening itself is made of 17/32" brass, with a hole cut to fit my darts in it. Attached to this piece, and nested in the barrel itself, is the 9/16" brass. This means that around the 17/32" brass that is the breech, there is a space that 9/16" brass can fit perfectly into. That would be the piece in the part pictured below. The barrel itself remains stationary; you can see the screw holes in the top piece where it screws into the receiver. The Bottom piece is basically a long piece of 1" thin-walled PVC with some filler at the bottom, 2 washers (one in back which
is visible, and another on the inside, that makes contact with the other washer on the rear end of the barrel, which is also visible), an o-ring, and the brass bolt. In short, the bottom piece moves back and forth, and the brass that is a part of the moving piece will uncover/cover the breech as it moves back and forth. The o-ring on the bottom part is there to form a seal with the receiver, as the plunger hits where that foam padding is. If you don't have a seal there, the air will all escape around the moving part. The pump is attached to the moving part (not quite sure what to call it to be honest) via some screws.

PLUNGER

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I cannot describe how much time went into this thing. It wasn't even taken up meticulously cutting, but sanding away the inside of that damned washer to make it fit. The reason the plunger head is so big is to ensure that the back piece moves straight back centered; when the plunger is pushed back, the back piece must engage with the catch pin, which involves it fitting through a hole just a little larger than the catch face itself. At each joint, there is music wire that is pushed through a hole in order to strengthen everything. The beveled end
to the plunger allows the plunger to push down the catch pin when it gets to it. The catch pin then goes back up after the catch face, and the rest is common sense. This shortened plunger is what allowed the gun to be 28" long yet have a plunger tube length of around 5+".

Trigger, Catch, and t3h Lower Receiver

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This part really is self-explanatory. The trigger plate is made out of aluminum, and it pushes the catch pin (which is not in the pictures) up and down. It's basically the same system that is used in the SCAR-N, the GNS, and the BS-9 (all Boltsniper's). The trigger itself is made of 2 pieces of plexiglass bonded together. It is one in the picture, but it's two as of right now. Trust me, if you use one it'll snap, and it'll suck. The handle. Oh what a bitch this can be. If you just use epoxy or superglue to bond it on (unless you're really good with the stuff; I have terrible luck however, even after I properly sand the surfaces and everything), it tends to fall off easily. As such, I just filled half of my handle with Bondo, and put some screws straight down into it after the Bondo dried. That handle isn't coming off any time soon.

Stock

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That's the stock. You can pull it off in case you need to check the condition of the plunger without taking the whole gun apart. The holes are there because the plunger gets such a good seal with the receiver, that when you fire it a vacuum actually sucks air from the back, and without the holes the plunger is slowed significantly.

Construction

This thing is less complicated than pretty much any of Boltsniper's weapons. I mean, you pretty much put it together the only way it would be able to go together. You start with the upper receiver, you stick the main spring in, then the plunger, then the part that moves, then the barrel, you screw in the barrel, then stick on the lower receiver. Done.






I'll get videos up later; transferring all this info to an NH post has taken it out of me.

Oh, and I'd like to say this is property of NH and Boltsniper.com (if I can get the template back to normal).

~ompa
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#2 meiser5

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Posted 22 August 2006 - 01:57 PM

This is a qeustion I wanted to ask someone for a long time, is that sight real or is it for show?

Meiser--- ;)

Edited by meiser5, 22 August 2006 - 02:01 PM.

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QUOTE
Account Suspension Notification

[DYE]Terminator[gen],
Your member account at NerfHaven has been temporarily suspended because I don't like you. Shindig doesn't like you either. You watch yourself, we're wanted men. I have the death sentence on 12 systems.
Talio---

#3 NiteWalker

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Posted 22 August 2006 - 02:04 PM

Nice! I guess you're into doing your versions of Boltsniper's homemades now eh? Maybe I should try doing a homemade soon. Oh, and how long did it take you to build that?

Edit- Ok, I thought you were doing your own version of his gun because of the topic title.

Edited by NiteWalker, 22 August 2006 - 02:23 PM.

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NEW Write-up of the DTG/At3k:
Click here
Credit to Carrtoon for the mod.

"The mother of invention is need... Who doesn't have to pelt people with foam?"

#4 ompa

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Posted 22 August 2006 - 02:11 PM

Sight is fake. I mean, you could use it, but it's not meant for pin-point accuracy.

I'm not really doing versions of his guns on purpose. I just really wanted a pump-action bottom-fed clip gun. The SCAR-N was a gun that had those characteristics, so it happened to end up looking similar.

~ompa
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#5 blinkycc13

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Posted 22 August 2006 - 02:40 PM

Nice! Did you model that after the AUG?
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Sorry if I missed it, but what is the carry handle made of?
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QUOTE(Dark Shrimp @ Nov 10 2006, 11:06 PM) View Post

This is called a screwdriver it is used to unscrew or screw in screws.

#6 mav3r1c

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Posted 22 August 2006 - 06:27 PM

Thats awesome man. Thanks for the write up!
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#7 Lancaster

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Posted 22 August 2006 - 08:12 PM

I'm glad to see a version of the SCAR-N that doesn't require AR-15 parts. This might be a future project for me, great job. :D
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#8 ompa

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Posted 22 August 2006 - 08:16 PM

Firing Video- 3 rounds.

~ompa
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#9 Snazzy Q

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Posted 22 August 2006 - 08:38 PM

I like it! It has sort of a "G36 on crack" look to it. Have you had any problems with the bolt system yet or is it feeding smoothly?
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#10 ompa

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Posted 22 August 2006 - 08:50 PM

The bolt system itself is working perfectly. I was astounded at how well it worked. What I need to do currently is find a better way to make those mag springs. I mean, the way I currently make them is time consuming, and isn't as strong as I'd like it to be. I could probably find some thicker gauge wire, but last time I went to ACE I got the thickest I could without getting into ridiculously thick wire.

~ompa
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#11 puggy

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Posted 23 August 2006 - 05:30 AM

You didn't use a AR15 spring for the main spring did you?
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#12 Snazzy Q

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Posted 23 August 2006 - 09:36 AM

Without shells how do you ensure that the stefan goes all the way into the chamber without the edge of the outside part of the bolt catching it? It seems like with even a slight curve to the dart the edge of the dart would stick out a bit. Obviously it works, but I'm still not quite getting how.
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#13 elf avec gun

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Posted 23 August 2006 - 10:40 AM

What kind of spring did you use? Did you use a box spring or a spring like the one in the LS mags? I could'nt see making one of the LS type springs being too difficult but yes a box spring would be time consuming to construct.
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#14 boltsniper

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Posted 23 August 2006 - 11:11 AM

Its actually a pretty forgiving system. The dart does not need to be prefectly straight. But there is pressure from the darts below compresing the chambered dart a little. When the bolt is closed the brass simply slips between the 2 darts and closes the breach. I have been surprised how forgiving it is and how well it works.
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#15 sam

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Posted 23 August 2006 - 11:40 AM

So your plunger is still the 1/2" endcap in 1" thinwall PVC except that it is housed in 1 1/4" PVC?
Also could you shed a little more light on how you cock the gun with the pump action system.
Awesome work.
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#16 ompa

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Posted 23 August 2006 - 04:19 PM

Agreed. When Bolt first showed me his idea for the bolt, I told him I thought it wouldn't work because there wasn't enough tolerence for the brass to go between the darts. Then we both built successful ones and just stopped questioning why it worked.

I for one have seen no reason to question it, as I'm afraid if I try to figure out why it works so well it'll stop working.

~ompa
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#17 Ryan201821

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Posted 23 August 2006 - 07:55 PM

Very nice ompa, as always. It is great to see that someone other than Bolt can make something similar to the SCAR-N.

All you have to do know, is give it a bitchin' paint job.
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#18 nerfer34

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Posted 23 August 2006 - 09:00 PM

Your work is getting better after every homeade!
Nice! I like how it has nothing to do with shells.
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#19 Ronster

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Posted 23 August 2006 - 09:27 PM

Why is the lengh to pull the pump so big?
I think the gun would look so much better if it wasn't so long after the mag... Kinda looks oblong as it is.

Very, very awesome, no doubt. I really like it. One of the cleanest things you've done to date.
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-I Nerf, there for I am.

QUOTE(baghead @ Oct 25 2006, 09:55 AM) View Post
Ronster reminded me that I should have warned you all Prepare your Bladder for Imminent Release!!!!

#20 ompa

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Posted 23 August 2006 - 11:25 PM

Because I was hoping for a monster range. Didn't happen though. Although I've noticed my barrel is too short; I'm playing around with barrel inserts for increased range; so far I've gotten the max range up to 110'.

~ompa
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#21 Ronster

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Posted 24 August 2006 - 05:32 PM

110?!
That's not bad. Not bad at all!
I love the shell-lessness to it.

What spring did you use, man?
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QUOTE(baghead @ Oct 25 2006, 09:55 AM) View Post
Ronster reminded me that I should have warned you all Prepare your Bladder for Imminent Release!!!!

#22 ompa

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Posted 24 August 2006 - 05:54 PM

One-and-a-half BBB spring(s). The plunger tube is that big. It is also the reason I'm a bit disappointed at the range, but any more is probably overkill anyways.

Just did a little test firing outside my house. One of the 7 shots went out of control (fishtailed alot) and went around 90'. The rest ended up around 100-105', with one landing around 110'.

At this point I'm done playing around with the barrel lengths. It's around 32' with the removable barrel insert, which is longer than I wanted the rifle to be originally, but whatever works I guess.

~ompa
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#23 Ronster

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Posted 24 August 2006 - 06:01 PM

How many darts can you fit into your magazine?
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QUOTE(baghead @ Oct 25 2006, 09:55 AM) View Post
Ronster reminded me that I should have warned you all Prepare your Bladder for Imminent Release!!!!

#24 Shadow 92

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Posted 06 September 2006 - 06:19 PM

How hard is it to pull the pump back and prime the gun? If it isn't very hard, you might be able to squeeze out a couple more feet with a longer spring from Ace rather than the one and a half BBB spring. It's just a guess, because I'm not 100% positive about it, although I think I remember someone posting how a longer spring will generate more force than two springs of the same length total.

Anyways, great job! The shelless feature might actually convince me to build it.
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#25 General Cole

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Posted 06 September 2006 - 10:03 PM

Could we have dimensions for this gun and if you put it up can you sell me enough Brass to make two of the guns?
We should stop calling out/making fun of/pissing GC off. He's actually contributed and is available for trade. He's a better than average member no doubt. Got your back Cole.
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You know what... I know it's kinda late... but Props Cole.
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