That Made in Canada M203 project...

Rather than machining the rifling, could they not be forged into the bore?

Perhaps have a lesser cost option for those wanting smoothbore launchers?
 
As far as smoothbore is concerned I would be happy enough with such...consider what a rubber slug moving at 250fps for nonlethal home protection could do.

As for rifled bore I think it only has application for the explosive shells in order to spin the centrifugal locking safety(and to give it a modicum of accuracy).

I too however would like the feeling of knowing that it IS an M203 and not just a smoothbore knockoff.

Peckerwood
 
sigger69 said:
Anyone thought of using composites?

http://www.azom.com/details.asp?ArticleID=2650

How about using an aluminum outer with an internal molded composite inner sleeve with rifling, or just the whole thing done in composites?
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Thats going to be inexpensive! :lol:

I would look at Swiss Arms, seems to me they sell barrel blanks, maybe we could get some off there 40mm line.
 
sigger69 said:
koldt said:
They are aluminium barrels, but I think the hard part would be the cutter for the rifling. And the cost to make a cutter would be big, especially for the intent of the civilian Can. market, 50-100 units at most? The outside machining wouldn't be that difficult for any regular shop. It appears that the top "stuff" rail guide, cocking piece "holder" etc. are welded onto the barrel after the barrel is finished. Can anybody comment further?
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There must be some innovative way to make the rifling! :twisted:
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I'm been wondering about how hard a home-brew electrochemical setup would be. The process is explained in a general way here: http://www.firearmsid.com/Feature Articles/ecr/electrochemicalrifling.htm

Basically (for those who don't want to RTFA) you'd need a plastic rod at the land to land diameter, with grooves cut where you want the grooves of your rifling to be. The bottom of the grooves get a conductive electrode inset in them, the rod is inserted in the smooth barrel, and electrolytic fluid is pumped through the spaces between the electrodes and the barrels, while voltage is applied between the barrel and the electrodes. This eats away the grooves in the barrel.

Apparently S&W is using the process for some of their revolvers; I'm curious whether the process could work on a small (non-industrial) scale.

40mm barrels seem like an ideal project to try it out on, as the plastic blank would be large and relatively easy to make.

Any takers? I don't have the resources or a particular inclination to try this out right now, but thought I'd throw it out there.
 
i'd be happy enough with a smooth bore 203.

as far a dlask making the barrels, i think they only cut the blanks outer surface. i don't think they have a rifling machine.

maybe leverarms or marstar could talk to norinco :oops:
 
Too bad OGT does not have anymore of the Israeli cast off M203's and parts (he has some but very minor ones and not a lot - I asked)

I know there are SOME extra barrels out there - the question appears to be is it worth doing this (the small parts have to be manufactured too).


One member gave me some ideas on the barrel - CNC cut it polygonal and a few other ideas in addition to what is above have been floated.

Ideally we could get TSE to bring in 50 or so barrels from Swiss Arms - stamped not for Grenade Launcher Use ...
 
cpt. canuck said:
And if that fails we could all ways get toysareforboys to set us up
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Unfortunatly, the airsoft models (every one), has straight rifling (no twist), so it's pretty much like a smooth bore.
 
KevinB said:
One member gave me some ideas on the barrel - CNC cut it polygonal and a few other ideas in addition to what is above have been floated.
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You could vary likely cut a traditional rifling type barrel on a CNC lathe as well. It would be the same as cutting a multiple start thread. What is the rifling twist? Anyone have a picture taken of a M203 bore?

greentips said:
We have some custom barrel maker in canada right? A couple of them are CGN members. If they have those old cut-rifle machine, can we apply the technology to a 40mm bore? We can cut one rifling a time but the setup cost should be much lower. A higher unit cost is tolerable in this case. I am not an expert, but I think the cut-rifling technology from those match barrel custom shops are much more scaleable than the button rifling and hammer forging process, but they are much more labour intensive. Aluminium should be a pussy to machine.
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This really would not be that hard. I know a guy that built a set up to rifle shotguns this way. The gun he showed me came out vary nice you could not tell it was a DIY job.
 
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