Bolt Action Sniper Rifle - C02 Powered
Posted 28 February 2003 - 05:21 PM
This is my first post at Nerfhaven. I have been working on a bolt action rifle for a few days now. The pics of what i have so far are here:
The rifle fires 5/8" stefans. The dart is loaded into the shells (seen below the gun in the pics) and then loaded into the magazine. The action works with a reciprocating rotating bolt. When the bolt is all the way back a shell falls into the chamber. As the bolt is pushed forward the shell is seated at the end of the barrel and is sandwiched between 2 o-rings on either side of the shell to maintain a tight seal. After firing the bolt is pulled all the way back and the spent shell is ejected out the bottom of the gun. At the same time another shell is falling into the chamber for the process to repeat. The action works perfectly with nearly zero jams. The v1 of the gun is the finished mechanism of the gun with no propulsion installed. The v2 of the gun has a airtank placed underneath the barrel and is a full functioning gun. The power with this setup is relatively low however. I just can`t atttain a high enough pressure with a pump airtank to achieve the velocity i want. I am now looking into C02 for propulsion of the darrs. The gun is about 4 feet long but is easily handled. Removing the screw on silencer greatly decreases the bulkiness of the gun. The silencer is constructed like that of a actual firearm silencer. There is a extension of the barrel drilled with holes in a sprial pattern. Foam surrounds the barrel portion and is sheathed with 1"PVC. y using the wonders of PVC i was able to make the silencer removable. The trigger is composed completely of PVC and feels very nice. The entire gun feels very nice in your hands. If the gun is relatively accurate i plan to mount a scope on it. Take a look at the pics and let me know what you think/suggestions.
If anybody wants more details on the rifle feel free to email me.Rifle PIcture
Posted 28 February 2003 - 06:32 PM
Posted 28 February 2003 - 10:17 PM
Posted 28 February 2003 - 10:45 PM
As for co2, your moving into some dangerous territory. The quick change of pressure that co2 entails means that you could reach fairly low temperatures. PVC gets very brittle when it gets cold, and if you have high pressures and brittle pipe, you could have a problem. If you really wanted co2, your best bet would be a bike pump inflator, which works at relatively lower (safer) pressures and is compact enough not to get in the way. If you want a system with a few shots before re-pumping, you can always attempt a 2 tank system, in which you have one large, high pressure tank that you fill with an air compressor or large pump. That tank is connected to a regulator, which is in turn connected to a smaller, lower pressure tank. This is the tank which supplies the air for the shot. Once you shoot, the smaller tank repressurizes at the regulator setting from the larger tank.
I'm curious as to how the bolt pulls the spent cartridge back without fail, yet slides forward over the cartridge seemlessly when you press it forward.
Once again, very nice job.
Posted 28 February 2003 - 10:53 PM
Also, give me some tips on how you make your sprays on your guns so perfect! It looks almost as if you bought it that way, even better then how Hasbro paints theirs.
You're a dipshit, stop posting.
I'll let you know when you can start again.
Yes, I'm serious. ~Cxwq
Posted 28 February 2003 - 11:23 PM
I paint my guns with ordinary spray paint and then clear coat them to prevent the paint from coming off. I mask the parts I don`t want painted with masking and scotch tape. Nothing special really. i`m just a perfectionist.
Thanks for the info on C02. I`m aware of the material proerties of PVC and CPVC and I have been contemplating for a while how to deal with it. The air tank idea you have sounds good. But I am tring to avoid having a massive weapon to lug around. I want the gun to be easily handled yet very powerful. it needs to shoot like it looks. i`ll post again when I have any major developments.
I highly doubt I`ll ever sell these things. It took WAY too much dremel work to do over and over. The tolerances are so small and took so long to get right. I might draw up some plans and sell those however. Just curious, how much would someone pay for one of these guns????? or the plans????
Posted 01 March 2003 - 10:11 AM
Posted 01 March 2003 - 01:51 PM
Vinyl Tubing: ~$2.00
5/8" FBR: ~$3.00
Design & Labor: Priceless
So I`ve spent probably around $20.00 on this gun so far. Keep in mind I already have a lot of stuff in the area of tools some supplies. A dremel tool is a necissity to make the cuts I did. I used balsa for the magazine which is somewhat cheap but I already have a crap load of it. All the bonds were made with CA, JBweld, or PVC cement.
The supplies are cheap, it's the manufacturing costs that are through the roof........
Posted 02 March 2003 - 04:01 PM
I've found that selling modded guns just doesn't make sense for me anymore. I spend 4 hours slaving over a $10 gun and people (understandably, I guess) don't want to pay much over $30 for it. That's a pretty awful return for my labor since it's much more difficult than my $35/hour day job. I have a feeling you'd run into the same problem just on a bigger scale. People may be willing to pay $50-60 for the gun but it's just not worth it.
As far as the plans go, you could almost definitely make a little money selling those. Though as soon as you sold them once you'd have some piracy problems given the close nature of the online Nerf community.
Or you could gain instant fame and adulation by having us host the plans for free
Posted 02 March 2003 - 05:53 PM
I finished up my bolt action C02 rifle today. The pics of the final painted hun are here:
There are still a few very minor kinks to be ironed out. Nothing that can`t be handles and nothing that hinders the guns performance. I have not range tested the gun yet. But, from 40ft I can put a dart THROUGH a cardboard box with PINPOINT accuracy. I`m gonna take it outside one of these days to do some range testing: zero deg inclination shots. I`m also going to calcuate the muzzle velocity jsut cause i`m curious. The silencer makes a very noticable reduction in firing noise without hindering performance. Right ow I can get about 10 shots per cylinder of C02. This is a bit low but with this gun you aren`t going ot be cracnking shot after shot off. I hope. The low shot/cylinder is due to the trigger setup i have that lets more gas out than a paintball gun would per shot. In addition to the 5/8" stefans the rifle shoots micros as well. It doesn`t shoot them as well as the stefans but, it's still damn hard..... As always let me know what you think and ask me whatever you like about the rifle. I`m planning on mounting a scope for precision aiming. The gun is accurate to where it is pointed but there is no real way of aiming right now. I also though about using a laser sight. I haven`t thought much into that yet. Sorry about starting a new thread.......
Posted 03 March 2003 - 06:30 PM
Now for the performance results. I fired the gun outside in a field. The numbers I got are likely flawed because it was extremely windy today. Each shot was taken standing up with the barrel paralell to the ground: a zero incindence shot. With the silencer on and using a 5/8" stefan I got ranges of nearly 150 feet. Using a Nerf micro dart I got ranges of around 110 feet. I think these numbers will go up in situations where the crosswind is not so strong.
I`ve thrown up so pictures of the rifle with the scope and also a pic of me shooting it.
Posted 03 March 2003 - 07:19 PM
thanks and once again nice job
Posted 03 March 2003 - 07:33 PM
Posted 04 March 2003 - 06:02 PM
Posted 08 March 2003 - 02:10 PM
The trigger is made of PVC but the valve is not. I borrowed the valve out of an old broken paintball marker. One of them cheap ones from walmart. I`ve been working on a new trigger system that will reduce the trigger force and increase the shots/cylinder of C02.
I`ve explained the bolt action in threads on NerfHQ and Nerfcenter. Check there and then get back to me if you still want me to explain more.
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