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All Aluminum Paintball (and Nerf) Bolt-action Rifle

CO2 Paintball/Nerf HIgh Power Rifle

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#1 boltsniper



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Posted 09 November 2007 - 12:25 AM

It's been a damn while since I`ve posted anything on here. I thought I would have more time when I started working a normal job and have the weekends free. Well, I guess I have but there always seems to be something going on. I’ve been doing a lot of building as you`ll soon see. I do still intend to get Boltsniper.com put back together and updated. I would like to get the forums back up. I haven’t messed with it much at all in a while. I`ll probably just start the forums over from scratch when I do that.


I work with a bunch of people who like to Nerf and paintball. We do a fair share or both. I still get a lot of use out of the BS line of Nerf Guns. I mainly use the SCAR and the NTS. I lend the GNS out to whoever wants it. The FARihas been pretty much retired. It has taken a beating through the years. Still works, but has developed some cracks in places and I retired it to the wall. The SCAR is much more durable. I`ve actually dropped it on concrete a few times.

For a change of pace I decided to take a crack at building a paintball gun. If this is not fit for the homemade section because of the word "paintball" then feel free to kick it to Off topic or delete it altogether. I built this gun with the idea in mind of being able to breach load nerf darts for indoor nerf battle use, which works quite well by just taking the paintball magazine off.

SO, what we have is a magazine-fed bolt-action CO2-powered paintball rifle with the ability to single shot nerf darts. I`ll be honest, this is a paintball gun first, but I figured you guys would still be interested as a lot of it could be carried over to a primarily nerf rifle.

Excluding the obvious exceptions, the entire rifle is fabricated from aluminum stock. The barrel is 2024 T3 tubing with an inner diameter of 0.68 inches. Convenient for paintballs of 68 caliber. Is also a hell of a fit for mega stefans. The upper receiver, forend, stock tube, magazine, valve, and striker tube are all fabricated from 7075 T6 1" OD (0.125" wall thickness) pipe and 1" round stock. The lower receiver and FCG are cut from 1/4" 7075 T6 plate. I turned all of the round bar parts on a small lathe (Sherline 9" bed). Most of the turned pieces are 1" round bar of no more than 3 inches long. The largest piece I turned was the outside of the barrel for insertion into the receiver. Heavy use of the bandsaw, drill press, and dremel did the rest. The lathe will convert to a vertical mill and I made some use of this, but mounting parts on the cross slide is difficult and not accurate. I need a multi axis cross slide for milling. The rifle is assembled with countersunk socket head screws. They look awesome flush with the surface.

The rifle works much like any other paintball or CO2 gun. A striker is propelled via spring and impacts a valve stem that very briefly opens and releases some propellant gas. One of the images below shows the component break down of the rifle. The valve is positioned in the center of the rifle with the striker behind it. The trigger releases the striker and the bolt pulls it back when you retract the bolt to chamber a new round. It all works pretty fluidly. The magazine is a fixed tube magazine that will hold 10 paintballs. It is positioned ahead of the valve and under the barrel. Very shotgun-esque. When the bolt is retracted a ramp guides the next ball up through a hole in the receiver and into the chamber. Closing the bolt pushes the ball forward and seals the port. The magazine is loaded by retracting the follower all the way and inserting balls through a port in the right hand side.

The rifle works better than I had ever thought. The cycling works great. Have yet to chop a ball. Ranges are around 100 yards. Accurate out to 40-50 yards. I had some initial trouble with leakage around the valve seals, but a little RTV fixed that problem quickly. The little 2.5 ounce tank will last for 50-60 rounds or so with large time intervals between shots.

The next course of action is to touch up the blemishes and hard coat it flat black

Pictures ensue:


Major Components

All 51 pieces plus screws

Fire Control Group. The sear is a modified T68 sear. The rest is hand made.

CO2 Valve. The valve body was the most complex piece to fabricate. The tolerances has to be incredibly tight on the valve seat in order to insure a good seal. Plus the gas port had to make a 90 degree turn to re route the gas into the upper receiver.


Striker. I copped out and used a pre-made striker from a T68. Mainly because I didn`t have the steel stock to cut one. The striker tube was too large for the striker. It fit too loosely in the tube. I inset a piece of tubing in the striker tube to bring the ID down so the striker had better guidance. The striker tube itself required a lot of cuts and opening to allow the follower pin and sear to engage the striker from top and bottom. Pressure release holes are drilled in the forward end of the striker tube to release pressure ahead of the stiker when it is released.

Upper Receiver. The upper receiver contatins the bolt and the barrel. It is also what the stock attaches to. the bolt was the first component I fabricatied back in April sometime.

Barrel. The flash hider was cut free hand. Would have been a great project for the mill but I need a better cross slide to be able to do the operation.


Coming Together

I`ve got many more pictures and I can always take more. I`ll try to get some video of it cycling and firing.

I`ve also got this baby...

I need to work on a topic for her too.

I`ve got another strictly nerf rifle in the works. Similar to this one in construction.

Edited by CaptainSlug, 20 November 2018 - 02:40 PM.

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#2 CaptainSlug


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Posted 09 November 2007 - 12:38 AM

And here I thought I was going to be the only one machining trigger valves from scratch...
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#3 nerfturtle



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Posted 09 November 2007 - 12:39 AM

You're back! Let be the first to say that these are really kickass. I really like the tube mag, props on getting the reciever\ramp to work, it has been a huge problem for the crew working on the nerf shotgun to get a working prototype, but I guess it is easier to do with spheres rather than cylinders. As for the last pic, wow, I can't wit to hear more about that. Welcome back!
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#4 Carbon



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Posted 09 November 2007 - 12:44 AM

And here I thought I was going to be the only one machining trigger valves from scratch...

Design cage match! Two engineers enter...only one leaves.

Glad to see you back, Bolt...and good to see you've been spending time in the lab, so to speak. Looking forward to hearing more about those other creations.
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#5 baghead



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Posted 09 November 2007 - 12:47 AM

I knew You wouldn't fall off the face of nerf for good... cool stuff, as expected. Can't wait to see what you do next.
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Don't call it a comeback, I never left.

#6 jwasko



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Posted 09 November 2007 - 01:05 AM

When I saw a "new" topic by Boltsniper, I thought "Well, either he's back, or some noob necro'd an old topic."

When I saw that it was indeed new, I almost shed a tear.

When I saw the pics, I got flashbacks from my early days on the NIC (nearly a year ago, now), and pouring over the FAR, SCAR-N, etc topics and webpages.

I'd almost forgotten how brilliant you are, Bolt. Almost.

Welcome back, man.

Edit: Almost forgot to explicitly say: Nice work! I can't wait for the next topic. What could it be...

Edited by jwasko, 09 November 2007 - 01:06 AM.

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#7 six-five-two



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Posted 09 November 2007 - 01:53 AM

I think this is on everyone's mind:

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#8 Falcon


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Posted 09 November 2007 - 02:12 AM


You're an engineer alright.

Hot damn.
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#9 Ubermensch



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Posted 09 November 2007 - 06:18 AM

My jaw just dropped into China.
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#10 dadude778



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Posted 09 November 2007 - 07:12 AM

That is one of your best works yet, very clean, keep up the good work.
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Make sure the top of your gun is parallel to the ground when firing.
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#11 deaddumpster



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Posted 09 November 2007 - 07:30 AM

That's one of the cleanest, most beautiful things made by you sir. But, about how much did everything cost all together? What's the approximate weight of it as well?
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QUOTE(VACC @ Jan 15 2009, 01:55 PM) View Post

I've said it before, and I'll say it again. A good nerf gun is like a good woman. It shouldn't require extra lubrication.

#12 precisionnerfer



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Posted 09 November 2007 - 07:44 AM

Is this guy legal?
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#13 Guest_yourface_*

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Posted 09 November 2007 - 09:08 AM

Daamn, that's nice. I would have to say that's the best-looking paintball gun I've ever seen, and certainly in the top five Nerf guns. I usually prefer the Baghead approach with bright colors and wacky designs, but shit, that thing is cool.

I've got a guess for your last picture. It's a gatling gun, am I right? Or it could be a huge shotgun.

Falcon: What the hell is that sig? Is it ASCII art or something?

Edited by yourface, 09 November 2007 - 09:54 AM.

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#14 SPU-Nerf



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Posted 09 November 2007 - 09:13 AM

Do you have a gun smithing permit??
With that gun you might want one before the ATF comes knocking...
Either way the gun is badass.
I like the shiny, but you want it black, then it would be even more "real" gun looking! Scary!
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#15 penguin807



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Posted 09 November 2007 - 10:42 AM

I'm not sure if I love you or hate you right now. Excelent job.

Edited by penguin807, 03 January 2008 - 10:51 PM.

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#16 OfAllTheNerf



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Posted 09 November 2007 - 03:22 PM

Welcome back Boltsniper!

That gun is insane! Can't wait for the nerf homemade.

Posting from my friends iPhone ;p


Edit: You really are a genius. I can only understand how plastic toy guns work, and can't even fathom how you could create an entire co2-based gun. Excellent work.

(Sorry I didn't say more before, but its kinda hard to type on an iPhone when its 20 degrees and you've been outside for 2 hours...)

Edited by OfAllTheNerf, 09 November 2007 - 07:08 PM.

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Posted 09 November 2007 - 04:10 PM

The king has returned! That thing is in-fucking-sane. For a second, I thought this was a necroed thread, then I saw the title and the reply count and thought it couldn't be true. I almost ruined a $55 pair of pants when I saw that gun, though. Keep it up, man.
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#18 boltsniper



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Posted 09 November 2007 - 05:18 PM

I guess technically this is BS-11. The eleventh gun I have designed and at least started building. The bottom picture of the initial post would be BS-10 and yes it is a Minigun (paintball minigun). I`ll leave the nerf minigun to Captain Slug. I`ll try and put a post together of that one as well in the not to distant future.

Aluminum stock is cheap. I picked up a crap load of random stock sizes from onlinemetals.com. Depends on the alloy you get as to the price. 6061 is very cheap. 7075 is not bad. 2024 is the priciest but still isn`t too bad. 7075 is the strongest of the 3 alloys. Pipe and tubing are only available in 6061 and 2024. I splurged for the 2024 tubeing for the for strength. I got 6061 barrel tubing for the minigun and it is quite ductile. THe 2024 is substially stronger. The round bar stock is 7075 which is plety strong. All the alloys are very workable.

3 foot 2024 0.68 ID tube for the barrel : $16.00
2 X 1 foot 7075 1" round stock : $12.00 each
5 X 1 foot 1" OD 0.75" ID 6061 Pipe : $7.50 each
3 X 1.5 X 12" 0.25" 6061 flat bar : $2.50 each

I used a few other random sizes here and there too. 1/4" rod for the bolt handle. Tubing for the flashhider. So about $80 worth of aluminum. Sounds like a lot and I guess it is but it is aircraft grade aluminum and you end up with a lot of scrap you could use for other things later on. Altogether it's probably $100 worth of materials and components.

It is pretty light. Just under 4 pounds with tank and scope.

The tube mag and ramp works great. BUt yeah, it is much easier with balls than soft foam cylinders.

Good luck with your trigger valve CS. It was pretty simple to build but tricky to get balanced. I incorporated a large thow adjustment screw to adjust the spring tension on the striker. You can see it protruding just below the stock. It gives about an inch of adjustment. I also had a set of 5 different pwer springs to swap in and out. Initially I ran an inline regulator on the CO2 to control the pressure into the valve. I didn`t use it for long as it was able to handle the full tank pressure with no problem. WIth the masses and throws I have, the medium power striker spring seems to work best. It gives a pretty range of velocity adjustments with the tension adjustment screw. There is a fine line to balance the force the striker exerts on the valve stem at rest and the force the valve spring and gas pressure exerts to close the valve. To large a striker spring will hold the valve open after it drops. Gotta get just below this region. I also had a slight probelm with double stroking. The striker would bounce off the valve and restrike the valve stem releasing another smalller burst of air. Adjusting the tension spring and the striker stroke fixed this problem.

All my tanks are empty right now but I`ll try and get some video of the rifle cycling and what not tomorrow.
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#19 All Star

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Posted 09 November 2007 - 05:53 PM

Awesome boltsniper! I never would've thought it could work!
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#20 six-five-two



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Posted 10 November 2007 - 12:58 AM

Boltsniper, are you ever going to update Boltsniper.com?
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#21 ultra920



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Posted 10 November 2007 - 07:58 AM

a hundred YARDS. damn! That'll hurt like hell if it hits.
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#22 boltsniper



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Posted 10 November 2007 - 06:16 PM

The ball fit in the barrel is quite tight so you get a lot more power than your typcial PB gun. About 100yds max. I've played with it twice so far and had it turned down pretty far. The longest shot I took was probably 30-40 yads.

BS-11 Loading and Cycling Video

Above is a video of loading 10 balls in the magazine and then cycling them through. I apologize for the large file size (67MB). Hopefulyl everyone has at least DSL now....

The balls I used in the video are rubber practice balls. They are about 0.66" diameter so they will roll down the barrel. You can see em popping out of the end of teh barrel. Actual Paintballs will not do this. I can`t cycle real balls without firing them cause they would all get backed up in the barrel. Ive tried it...

The maga follower stops when it hits the end of the ramp. The last ball in the mag will not make it into the breach. That is why I rock the gun over for the last ball to roll it into the breach.
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#23 ultra920



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Posted 10 November 2007 - 06:45 PM

For a second there, i thought you had a serious weapon there. Oh wait, you do. man, people should need a license for stuff like that.
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There is no Ultra, only a 920.

PSN: ultra920 MGO:ultra920 shoot me an MGO invite if you play

#24 Prometheus



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Posted 11 November 2007 - 01:52 AM

For a second there, i thought you had a serious weapon there. Oh wait, you do. man, people should need a license for stuff like that.

Fuck that noise, it's a non-lethal recreational device.
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#25 BustaNinja



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Posted 11 November 2007 - 09:24 AM

Damn. I originally got into nerf by way of the plans for your FAR. I then got intrested in homemades after I saw more of your work. This one takes the cake. Thats a damn fine looking piece of artilery you got there. I would also advise against painting it black. It already looks to real. But still, NICE!!
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