Instructables
Picture of Handmade Airsoft Rifle
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A simple airgun that was made from a piece of brake line, a blowgun, assorted air-tank type connection parts, and some (unknown type of) wood that we had laying around.

The basics:
What you'll need to build a gun of any sort, whether it's this one or any other is four simple components.
1: A barrel- Without this critical piece, your gun is just going to spit air everywhere and you'll have no place to put a projectile.
2: A projectile- This flies out of the barrel and at your target. This can be just about anything that fits down the tube.
3: A propellant- This forces the projectile out. For this, we'll use air. Compressed air, to be more precise.
4: A frame- Without a frame, your gun is more a mess of pipe that looks like you threw it together in 10 minutes. You don't want that. It's great when in a pinch and you want to try it out, but not so great after a month of battling and/or target shooting when people start asking, "When are you going to finish that?"

Now, in my case, I had the first 3. I felt I wanted a frame that was different. Now, I say this because I appreciate originality, and if you want to build my rifle from pictures alone, feel free, but I wouldn't mind seeing other rifles (I call any gun with a stock that, just fyi) based on my design. Heck, build one just using my instructable as a guide if you want.

Things you'll need:

A barrel in the size of the projectile you intend to shoot and adapters to fit the blowgun.
An air-type blowgun. I found an odd one in someone's garage sale and picked it up for $3.50.
A handful of handsaws (or a few good power ones. I can't make a lot of noise or the neighbors complain)
Plenty of your favorite drink. I chose Mountain Dew and good ol' Black Coffee.
A piece of wood. any dimension works, and any type (pine, oak, spruce, maple, etc) will work. Just remember that you'll have to deal with the lovely factors of more sweat in the project if you use harder woods.
Your most comfortable pair of safety goggles/glasses. You need your eyes for this project, so protect them.
Plastic and metal plumbing parts. I used metal for the gun, and plastic works, too, if you want to lighten it.
A regulator (probably the most expensive part of my project and the one that I actually had to buy.) You need this to take the air pressure down from tank pressure and make it variable. This is a nice factor to have.
Quick Connect couplings (optional) for those of us who don't want to waste any time after we finish shooting. Nothing better than a quick connector to disconnect the gun from your air tank.
An air tank. Where else will you... well, I suppose you could pump it up with a bike pump, but I didn't like that. I prefer an airtank in the backpack, and a small electric compressor to fill the tank at times.
A marking device for making rough measurements (that's what I did, at least)
A dremel (or other brand of rotary tool). This will save your butt many times. Ours has been beaten and abused, but still works.
A work surface
Ammo
a) 2 part Epoxy (the stuff I almost swear can't have been made by mortal hands.) You'll need this to make your rifle frame bond to the barrel and the rest of it.
b) Electrical tape and superglue to hold the barrel together.
c) Extra zipties for holding the barrel together.
Zipties to hold everything together.
Teflon tape for sealing airline connections.
Wood screws to hold things together.
A screwdriver to install wood screws.
A drill might help at times. Sometimes a Dremel, while it spins faster, can't do the job.

Okay, onward!
 
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oooops disregard all the pics except the last one . sorry madrias357 that is my sniper in progress
Madrias357 (author)  pirate of doom5 years ago
Not bad at all! I'm working on getting a video of mine. If only I hadn't done my target practice on the owner's manual for the camera, I'd be done by now! As for the extra pics, I don't mind. Accidents happen. And originally, it did have a BB feeder, but was being a problem in that some of the air would go into the tube and blow the cap off, wasting air and ammo.
im building a double barlle machine gun its got a small air compresser on it and hopefully it works
Madrias357 (author)  toxincool5 years ago
How do you plan to get the ammunition into the barrels, though? This design is primarily a high-accuracy muzzle loader. I've seen this design, however, twisted by friends into many things. (like say, a mid-accuracy high rate of fire fully automatic pellet blaster: make sure bbs will roll through your connector and then put a "Y" pipe on the back of the barrel. Top part is your ammo, bottom is your air, and the common exit is the barrel.)
have u seen those pillbottle small chine guns
that what im making only bigger
Madrias357 (author)  toxincool4 years ago
I understand now.
can u show a pic of the actuall gun thanxs
Madrias357 (author)  matthewmania4 years ago
Unfortunately, I no longer have this one as it kinda got sat on and bent the barrel and frame.  That and my friends didn't like going against it (I had it chronographed, and at 40 PSI (my usual regulated amount), I was breaking 400 feet per second with .2 gram airsoft BB's.  They also didn't like that at 55 PSI, it could shoot 550+ feet per second.

Instead, I've put the guts to use for making the ultimate water gun.
im using this idea to make a muzzle loader rifle and pistol in one . Itll have a backpack with over 200 psi In and a Small compressor with a laptop battery to power it The tanks will be shared between guns so i can usse my rifle then quickly switch to the pistol . All im gonna need for the pistol is some hosepipe a schrader valve 2 cola bottles and some copper pipe!
Madrias357 (author)  stephenniall5 years ago
Pretty cool! Done just about the same way, except I left the compressor out, carried a 7 gallon airtank in my backpack, and only had 120 PSI in it. Also, my barrel, on the original before adding wood and such to it, was interchangable for a shorter barrel.
xZCodmaNZx5 years ago
weird you get the tubeing the smallest i can find is like 10-12 mm : [
Madrias357 (author)  xZCodmaNZx5 years ago
Farm and Fleet. It's a piece of brake-line. Don't remember the exact measurements, but best bet is go just slightly over 6 mm.
Madrias357 (author) 5 years ago
Well, I no longer have this one. Kinda had an accident with a friend, left it in a recliner and his dad, without looking, sits on mine. Bent the barrel and broke the stock off. So, I'm working on V2, which will be bolt-action.
this is impressive , try to make a bb feeder . im making a airsoft sniper that is bolt action and has a 12" long 1.5" air tank. i may put up an instrucatable still deciding . if you would likewhat you see of the unfinished gun shoot me up at laggger.saf@gmail.com
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Kaelessin5 years ago
heh you oughta take some video of it in action some time too!
Madrias357 (author)  Kaelessin5 years ago
That will be sometime after I put my new under-barrel on with a trick a friend gave me: Wire. Wrap it around many times, stapling now and again, and you have a sturdy barrel wrap. I also need a good day to shoot a target here. Those aren't easy to get, but I will have one good day next week some time.
where do u live that u hav 2 wait 2 weeks 4 a good day?
Madrias357 (author)  marshman195 years ago
Sorry! I've been swept up by other projects lately. I was planning to shoot inside at a target, but my unfortunate problem is: Finals are next week and I've also been studying hard for those. So, likely after next week, I'll put the camera out there, prepare to shoot, add my old 256 MB SD card to the system, and capture some video. That and I also have never used YouTube for posting video before. Heck, I've never posted video before.