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| shud_b_rite |
 Posted: 02/26/2007 1:34 AM Post subject: Optom mini shot |
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1st Lieutenant
Joined: 30 Jan 2007
Posts: 291
510.07 Spud Bux
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This is my first cannon I have posted on this website, I thought that after asking so many questions on this website I should actually post something useful. So I present you with Optom mini shot (well hey ya gotta call it something)
This is incredibly simple, it is made using:
Shrader valve
Air compressor tire inflater with gauge
60 bar rated pressure hose
Air compressor male and female quick connect fittings.
2 hose clamps
The barrel is from a $11 weed sprayer (thanks to MrCrowley for the idea, works great)
Like I said it is incredibly simple. The blue hose acts as a small chamber which can be filled to 70psi with 5 pumps using a foot pump or simply connect it to an air compressor. I am pleased with the performance of the tire inflater, the gauge on it is very accurate, it is rated to 12bar and has reasonable air flow. I made a poor harder breach loader using a plastic straw I got from the weed sprayer to cover the hole.
I have been shooting plastic bb's at 70psi through several layers of cardboard up close (wear eye protection) as accuracy with plastic bb's isn't to great. I will get some ball bearings or steel pellets and try them out. I also hope to get a 220psi 12v compressor to take it to the next level because my crappy foot pump says it can pump to 125psi but I cant get any higher than 72.
But yea anyways, I reckon its not too bad for what its worth (about $20 and still have leftover parts). Once I figured out how I was gonna do it it took me about 10mins to put together.
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| The stuff that makes it tick |
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| My poor harder breach loader |
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Last edited by shud_b_rite on 02/27/2007 21:58 PM; edited 1 time in total |
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| experament-u2 |
| Posted: 02/26/2007 2:25 AM Post subject: |
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Lieutenant Colonel
Joined: 26 Dec 2006
Posts: 478
603.61 Spud Bux
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it looks awsome anychance of damage pics
i to have used the neck of a weed sprayer for a barrel
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| shud_b_rite |
| Posted: 02/26/2007 2:35 AM Post subject: |
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1st Lieutenant
Joined: 30 Jan 2007
Posts: 291
510.07 Spud Bux
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| Yea I'll do some 2moro and I'll see if i can get some steel pellets too.
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| Mr.Russ |
| Posted: 02/26/2007 4:36 AM Post subject: |
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Lieutenant Colonel
Joined: 26 Jan 2007
Posts: 429
459.48 Spud Bux
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the trigger looks a bit weird...
but other then that good gun!
ever thought about mounting like a mini pump on the side of it?
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| Hotwired |
| Posted: 02/26/2007 4:41 AM Post subject: |
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UK Spudgunner
Joined: 13 Oct 2006
Posts: 1808
3912.38 Spud Bux
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Definitely a new design 
Why didn't you mount the barrel and hose the other way round? The trigger would then pull back instead of upwards.
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| shud_b_rite |
| Posted: 02/26/2007 12:44 PM Post subject: |
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1st Lieutenant
Joined: 30 Jan 2007
Posts: 291
510.07 Spud Bux
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| If i did that then the gauge would be useless, it only measures pressure using the setup that I have. Anyway I have actually thought about buying a 300psi shock pump which should work very well because it is a very small chamber. But until now I will just keep the chamber in a coil
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| iknowmy3tables |
| Posted: 02/26/2007 14:03 PM Post subject: |
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Brigadier General
Joined: 15 Dec 2006
Posts: 1133
2685.49 Spud Bux
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watch out for those cheapo 12v compersers that claim to have 220psi or so, I bought one for $9 and the thing breaks before it even reaches 60psi or so, but this was for a larger gun but it might work for this gun, since the chamber takes so short to fill,
if you get one you will have to wait like 10-15 friggin minutes between uses too let it cool its getto chinese engineered @$$, and you cant let run or remain conected for more than 2mins or somthing, a good one will probably cost you twice as much
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| shud_b_rite |
| Posted: 02/26/2007 23:44 PM Post subject: |
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1st Lieutenant
Joined: 30 Jan 2007
Posts: 291
510.07 Spud Bux
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| My crappy foot pump has just crapped out on me so those damage pics will have to wait a week or 2 until I get a new pump. Its not that much of a disappointment though, shooting through 2 layers of cardboard with plastic bb's isn't that great.
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| subterranean |
| Posted: 03/07/2007 22:29 PM Post subject: |
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Master Sergeant
Joined: 21 Oct 2006
Posts: 166
391.35 Spud Bux
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| i like the gun. i really want to make a breach loading system like yours for my next bbgun. what type of tube is the barrel and the sleeve and does this method work well?
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| shud_b_rite |
| Posted: 03/08/2007 12:50 PM Post subject: |
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1st Lieutenant
Joined: 30 Jan 2007
Posts: 291
510.07 Spud Bux
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The barrel is aluminum i think, about 6.5 mm from a weed sprayer. What you cant see in the photo is the blu-tak that is used to seal around the barrel and the tire inflater. The gun works reasonably well, would work even better with metal bb's.
And also the tire inflator I used is meant for 90psi but it is rated up to 100psi. So when I pump it up to 100psi it leaks down to 90psi which is kind of stink.
The breech loader is nothing special, just a hole covered by a plastic straw. I made it thinking that I could build some kind of magazine to hold the bb's and turn it into an automatic.
If your gonna build a gun like this I would use a slightly larger chamber (not longer, larger) , and instead of using a dust gun or tire inflater, buy one of those super powerful sand blasters to use as a trigger or a sprinkler valve. While making this gun I discovered that it is important to have a fast opening time because even a small amount of air will push a bb straight out of the barrel.
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| subterranean |
| Posted: 03/08/2007 14:41 PM Post subject: |
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Master Sergeant
Joined: 21 Oct 2006
Posts: 166
391.35 Spud Bux
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| Are you saying that the barrel is not threaded onto the tire inflator? is it just glued?
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| zeigs spud |
| Posted: 03/08/2007 16:07 PM Post subject: |
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Colonel
Joined: 04 Apr 2006
Posts: 641
730.16 Spud Bux
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no. the i is connected to a male thread and the male thread connects into the tire inflator from what i can see. i sugest a hopper next time u make one. it makes much more rapid fire and has a great spouting sound that all love to hear lol. 
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| subterranean |
| Posted: 03/08/2007 16:09 PM Post subject: |
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Master Sergeant
Joined: 21 Oct 2006
Posts: 166
391.35 Spud Bux
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| does any one have any good methods of holding airsoft bbs in the barrel.
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| zeigs spud |
| Posted: 03/08/2007 16:19 PM Post subject: |
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Colonel
Joined: 04 Apr 2006
Posts: 641
730.16 Spud Bux
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heres an idea...i liek the second better
you have to click on it for the whole thing or it will be chicken scratch lol
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| shud_b_rite |
| Posted: 03/08/2007 20:44 PM Post subject: |
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1st Lieutenant
Joined: 30 Jan 2007
Posts: 291
510.07 Spud Bux
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| Zeigs spud is right. The chamber has a quick connect for an aircompressor that fits into the tire inflater. And the barrel fits firmly into the hole on the tire inflator and just has a bit of blu-tak to seal it.
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