auto piston v3.0

[Skywalker]

Yeah, that'd about do it! So, who's building? lol

[jackssmirkingrevenge]

excluding the option of the spring loaded ball at the entry point, it's close to my last design in the other thread.

[Ragnarok]

Yeah, that'd about do it! So, who's building? lol

I'm sorely tempted to make a version of the valve, but I've never made an auto breech before, so I'm not quite so sure about that part of it.

[jackssmirkingrevenge]

You've made other things very well, I'm sure the blow forward design would be well within your construction capabilities.

[Ragnarok]

That wasn't my primary concern, the reason I have never done such a thing before more lies in choice of ammunition, because I can't think of any spherical round I can get my hands on in reasonable quantities that is a sufficently good fit in any common size of copper pipe.

That's why all my semi ideas have been shell ejectors.

[jackssmirkingrevenge]

um... marbles, surely?

[Ragnarok]

um... marbles, surely?

Afraid not. The sizes I can get won't fit 15mm copper, and they're too loose in 22mm, sizes in between are rare, and expensive.

[Hotwired]

The small marbles seem to be about 15-16mm and I seem to have lost all the larger ones I had.

Marbles seem to be ammo for every other country but ours.

[Ragnarok]

Marbles seem to be ammo for every other country but ours.

That about sums it up. I can use them in 22mm pipe with plastic bag as wadding, but the only way they'll go down 15mm is smashed into pieces.
Most of my marbles are just a smidgeon smaller than a paintball, so they'd be great in the rare 20mm copper, which has an ID just over 0.3mm more than a paintball, but they're too loose in 22mm for them to go through a blow-forward loader without jams or multiple feeds.

I do have some 1/2" ball bearings which fit passably in 15mm pipe, but I don't particularly want to fire those as I need them for other purposes.

[Hotwired]

I can't think of any spherical round I can get my hands on in reasonable quantities that is a sufficiently good fit in any common size of copper pipe.

Actually I have a personal dislike for spherical ammo so I've deliberately avoided them.

Makes life a lot harder when it comes to designing mechanisms as spherical ammo just needs a simple hole drilled but a cylindrical projectile is a right git as it needs a rectangular slot.

[Ragnarok]

Actually I have a personal dislike for spherical ammo so I've deliberately avoided them.

I don't have a problem with as such, but I don't particularly like building any launcher so it is restricted to just one or two types of ammunition, which loaders solely for spheres will do.
I'm prepared to make such a sacrifice for things like airsoft pellets, or gauss guns, but I'm not half as happy making a launcher that can only handle paintballs, marbles, and an expensive variety of steel ball bearings.

[jackssmirkingrevenge]

I've always had 0.22 pellets as my intended ammo, hence the effort to create such loading mechanisms as opposed to clouds and vortexes.

[ALIHISGREAT]

um... marbles, surely?

Afraid not. The sizes I can get won't fit 15mm copper, and they're too loose in 22mm, sizes in between are rare, and expensive.

you could use a pvc barrel? there is some 12bar rated 22mm pvc from B&Q that supposedly fits paintballs perfectly, i have some but i haven't tested it out yet and spanerman used it as a barrel on his copper paintball gun a while back.

[Skywalker]

Ok, here's my idea for making my version of the gun. It shouldn't cost all that much, and should be relatively easy to build. And it should be simple to repair.



How bout it?

[Brian the brain]

16 mm marbles fit into 20 mm aluminium tube, wich in turn can be epoxied into 22 mm.

The large 1" marbles fit into 28 mm copper.
I used that on the sawed-off.

Ball bearings of about 9-12 mm in diameter would be a better choice for ammo, I think.
Marbles differ in size to much and I find them a little too large to use in full auto.
Bigger caliber means more gas to propell them.( although fun, CO2 is a bit too expensive to waste in large quantities)