Barrel Sealer Plans - Advice

[Tom]

If you are going to use a(Paintball) hammer valve, you can make the valve semi-automatic so it will automatical reset when you're filling it. By the way I am working on exactly the same gun.
GR.Tom

[ALIHISGREAT]

you can but most airsoft guns use 6mm

http://www.wolfarmouries.co.uk/airsoft/ ... id=8MMBB45 8mm bbs

http://www.wolfarmouries.co.uk/airsoft/ ... SUPENFMARU 8mm airsoft gun

http://www.wolfarmouries.co.uk/airsoft/ ... MSHCOLT6IN shiney 8mm airsoft revolver.

Oh cool, except I'm in Australia and i cant get that stuff

i personally think there is not reason to ban airsoft but the aussie government obviously have found a reason, here in the uk they have changed the rules, now you have to be a registered player to buy airsoft guns which is just a hassle.

[Marco321]

If you are going to use a(Paintball) hammer valve, you can make the valve semi-automatic so it will automatical reset when you're filling it. By the way I am working on exactly the same gun.
GR.Tom

Yeah, i was thinking that about that. Oh cool, i look forward to seeing it

you can but most airsoft guns use 6mm

http://www.wolfarmouries.co.uk/airsoft/ ... id=8MMBB45 8mm bbs

http://www.wolfarmouries.co.uk/airsoft/ ... SUPENFMARU 8mm airsoft gun

http://www.wolfarmouries.co.uk/airsoft/ ... MSHCOLT6IN shiney 8mm airsoft revolver.

Oh cool, except I'm in Australia and i cant get that stuff

i personally think there is not reason to ban airsoft but the aussie government obviously have found a reason, here in the uk they have changed the rules, now you have to be a registered player to buy airsoft guns which is just a hassle.

I know ey, i think it's because they resemble a real gun and also because they are dangerous firearms according to the government. The rules are so bad here, you aren't even allowed to leave a paintball field with any CO2 or HPA in your tank (thats in NSW btw).

I adjusted the design slightly to incorporate an integrated handle into the blowgun, i also was able to now simplify the trigger mechanism. I did this so the gun can be used shotgun style without a stock. Some people my comment on the pilot volume because of the blowgun, but i had to find a comfortable median between efficiency and ergonomics. Here is the new design



NOTE: The shradar(sp) is in a tee, which is using a compression fitting onto the copper chamber. The other side of the tee is threaded into another tee, so i can have the piston accessible and the blowgun attached underneath. I know the diagram doesn't exactly show that but meh, it roughly shows the idea of the valve. The design is more to show the idea, not the entire gun with pin point accuracy.

[Tom]

Did you make any progress yet? I've made a little bit, I machined a reducer from 40mm to 5/8 inch(16MM) fot the barrel out of black derlin rod. The piston is already done, right now I'm thinking of the desgin.
GR.Tom

[to_live]

i am making a sniper that is like that alot... mine is made from copper and a hand carved wooden stock. im waiting on a bit of money to come in before i start mine, altho i have most of the copper i need already.

[Marco321]

Hey
Nice work Tom and to_live
I am staring my gun when i finish my exams in 7 days. But i changed the plans lol. I wanted to mount a homemade shock pump so its now shotgun style with a metal stock.

[Lentamentalisk]

Can you share you coaxial breach system? I am very curious.

p.s. it is spelled "Schrader"

[Marco321]

Can you share you coaxial breach system? I am very curious.

p.s. it is spelled "Schrader"

Here is a design, i was given the idea by experiment-u2 over msn about 4 or so months ago so its not mine.


The tee comes out the chamber and has a plug to block airflow for when the gun fires. It goes all the way down the the barrel so there is no wasted air.

EDIT: Lol thanks

[ALIHISGREAT]

Hey
Nice work Tom and to_live
I am staring my gun when i finish my exams in 7 days. But i changed the plans lol. I wanted to mount a homemade shock pump so its now shotgun style with a metal stock.

i'm starting today if my parts arrive but you will probably still finish yours before i finish, and how come you are making it into a shotty style??? a pump action would only be cool if one pump=one shot...

[Marco321]

Hey
Nice work Tom and to_live
I am staring my gun when i finish my exams in 7 days. But i changed the plans lol. I wanted to mount a homemade shock pump so its now shotgun style with a metal stock.

i'm starting today if my parts arrive but you will probably still finish yours before i finish, and how come you are making it into a shotty style??? a pump action would only be cool if one pump=one shot...

The homemade shock pump makes the gun look like a pump action, but in reality it will take multiple pumps to obtain pressure. I changed the design to incorporate a shock pump.

[jackssmirkingrevenge]

The homemade shock pump makes the gun look like a pump action, but in reality it will take multiple pumps to obtain pressure. I changed the design to incorporate a shock pump.

I find that above a certain pressure the shock pump has to be rested against a hard surface in order to be able to pump it without having biceps the size of Bournemouth, so unless you want to stick to 200 psi or so I would advise against an integral pump.

[Marco321]

The homemade shock pump makes the gun look like a pump action, but in reality it will take multiple pumps to obtain pressure. I changed the design to incorporate a shock pump.

I find that above a certain pressure the shock pump has to be rested against a hard surface in order to be able to pump it without having biceps the size of Bournemouth, so unless you want to stick to 200 psi or so I would advise against an integral pump.

Lol
I work out alot
Also my gauge only goes to 220PSI so I'm sticking to around there

Quick question i have been meaning to ask you Jack, my gun is gonna be 220PSI, 3/4" copper chamber and a 8mmID/10mmOD barrel. What size chamber should i got for? I'm thinking around 60cm. I thought i would ask you because you have alot of experience with this sort of thing and i cant model my gun very well on GGDT because i don't know valve specs..... Any suggestions?

[jackssmirkingrevenge]

I would suggest as big as you are comfortable with pumping. In this case if it's a coaxial I'd go with a chamber that's the full length of the barrel. At 220 psi it shouldn't be that much of a chore.

That's if you want power of course, if you want something a bit quieter make it 10 cm or so shorter than the barrel, have that last length perforated and fit baffles and barrel shroud over the barrel and chamber for an integral silencer.

It will give you a pretty wide assembly, you can look to the Delisle carbine for aesthetic inspiration:



Or if you want something a bit more modern and "tactical" looking, how about the Talon SS:

[Marco321]

Thanks Jack, once again you have helped me, your a legend mate. I'm going for a combination of


and



and i have this as my design



Notice how I'm using doing my best to minimize piston movement and pilot volume to try be as efficient as possible.

EDIT:
One more question, for the pump, should i use 1/2" or 3/4"copper?

[jackssmirkingrevenge]

A scoped shotgun eh? Sounds like a bit of a contradiction but not unheard of. For example I know the Israeli special forces use scoped bolt action Mossberg 695 shotguns with rifled barrels on bipods to fire saboted slugs as an anti-barricade weapon.

One more question, for the pump, should i use 1/2" or 3/4"copper?

Go for the 1/2", less than half the pumping effort compared to the 3/4" for a given pressure.