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MP5 BBMG, Non Threaded Magazine (with video!)

Posted: Sun Sep 21, 2008 6:20 pm
by littlebro05
Hey guys,

After my holidays i've finally finished building a proper BBMG. As you can see I took a toy MP5 Navy and shoved the internals in. The magazine is non threaded, and is fitted into a 1" PVC Coupling. It's air tight and can fire not very well, because i've learnt my lessons on clouds running on 80psi 600mL coke bottle. Adding video once I've built a larger air tank.

-Specs-
Assumptions made with range using with prototype, the airflow from the schrader valve is quite fast. Will fire with 2L soon.
- Minimal Range 12m (lowest on pressure 20psi)
- Effective Range 15- 18m
- Max Range 25m (highest pressure 90psi)
- Added hop-up (Kash munni's Idea)
- Magazine is made from pressure rated air hose about 3/4"
- Barrel is made of two bic pen tubes
- operates on 90psi 2.25L.
- Muzzle Velocity = 300FPS0.10g 6mm beads
- Average Velocity = 200FPS
- Max Range Velocity = 150FPS

Anyway here are some pictures.

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With Stock

The gun without the stock, the toy MP5 I bought in Australia you could remove the stock which is a bonus for me. The ruler is 16cm.

Video of the gun's features, materials and firing:

Posted: Sun Sep 21, 2008 7:07 pm
by Davidvaini
looks good, I would put up a thumbnail so people will actually look at this.

Can you explain the firing mech? Is it my vortex cap design or is it a sideways cloud? or something else?

Posted: Sun Sep 21, 2008 7:59 pm
by littlebro05
Here are some more pictures to explain.

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The internals of the gun pretty self-explanatory, The white tubing sticking out is where i've placed my hop-up.

Image
That's where the beads go inside, colourful isn't it? :shock:

Image
Thats the mechanism, the white tube is the barrel and the metal tubing is where the air comes in. The airflow is quite good considering i'm using the schrader as an output valve.

Posted: Sun Sep 21, 2008 8:40 pm
by Lentamentalisk
yoza! its hard to believe that any feed at all. None of the air you are running through it "popcorns" the ammo at all. I would really suggest that you find a way to hook the air inlet up to the bottom of clip, otherwise you will be wasting a lot of air, due to bad feeding.

Posted: Sun Sep 21, 2008 8:42 pm
by littlebro05
Lentamentalisk wrote:yoza! its hard to believe that any feed at all. None of the air you are running through it "popcorns" the ammo at all. I would really suggest that you find a way to hook the air inlet up to the bottom of clip, otherwise you will be wasting a lot of air, due to bad feeding.
lol I have no idea how but we'll soon find out if it fires good or not, but at this point, the feeding of the ammo through the barrel performance is the same as my bbmg prototype.

Re: MP5 BBMG, Non Threaded Magazine (with video!)

Posted: Fri Oct 03, 2008 1:36 am
by littlebro05
Edit: Oops double post, pressed quote button instead of edit :S :(

Posted: Sat Oct 04, 2008 4:54 am
by lr-lars-nl
wow just wow, that's a nice gun you got there :D