Would it be possible to make a gas delayed firearm out of off the shelf explosion resistant tubing? Could this firearm hable intermediate cartridges (556, 545) if designed with a charging system that engages with a heavy duty spring after the round is loaded in the chamber and the breach is closed.
Sounds crazy enough to work, call it the FGC-556 (RIP JSTARK)
The main technical problems that i have found with the design would be that ECM rifling can’t go down to 22 cal.
It can't? Why is that? Surely theres another way to make the mandrel instead.
I asked why they weren’t able to make 223 barrels from ECM on an AG cast stream about the 3d printed AR upper and an admin that was there for answering questions stated that ECM gets harder the smaller the caliber, could be a bs statement though.
According to some Reddit thread 3d printing a mandrel that size would be a challenge, with fragility of PLA+ at that thickness.
Reddit post on fosscad -
https://www.reddit.com/r/fosscad/comments/lyd684/has_anyone_made_a_22_caliber_barrel_using_the_ecm/
>3d print mandrel in segments
>join them
>cast silicon mold around it
>pour epoxy into the mold and now you get a solid non-printed rod
Can it be done?
.22 ECM barrel liners are used for the YEET22 and can be adaptered for pretty much any .22lr at least
those FDM tubes wrapped around a liner is fairly low tech.
it's how lower end carbon fiber oxygen tanks are designed, thin base material, wrap it in carbon for strength
unfortunately it's not ideal for a lot of things as oceangate found out
You don't need rifling. Smoothbore 5.56 has minute of man accuracy at 200 yards. Some firm even tried smoothbore 5.56 totally not SBR shenanigan before ATF shut the down
You mean that Franklin armory thing that was supposed to be paired with like weird little torpedo shaped rounds?
I'm sure those aliexpress and Amazon tubes are really explosion proof. Go ahead anon, buy some and let us know how it goes.
I believe thats what most people use for FGC-9s and .22 ECM barrels but for something 5.56 or 7.62x39 Id probably want something made with with better quality control.
Ian from Forgotten Weapons says that the gas delay isnt generally strong enough to safely delay the opening of higher pressure rounds. A handgun does seems pretty simple tbh but manufacturing a slide seems pretty much impossible for the average home-shop gunsmith at the moment. Im also not intelligence-inclinded enough to know how to manufacture the gas piston or make the seal between that and the gas expansion section outside of the barrel gas-tight. It honestly seems like a good pathway for handguns and pistol caliber carbines/smgs, and with enough engineering an intermediate caliber certianly seems possible.
Someone smarter than me could probably theory-craft way better than that but thats just off the top of my head.
Why now just do regular gas operation? It shouldn't be that hard with a long stroke piston and a tilting bolt.
Thats a little complex for home gun building
Not much more than a gas trap, plus it'll actually work. If a bunch of Pookistanis can do it with hand tools, there's no reason why you can't do it with a drill press and a dremel
Im not an educated gunsmith or anything but when I hear tilting barrel I think locking block and locking lugs on the barrel and that seems difficult for homemaking because you'd need hardened steel and fairly precise machining.
Im drunk as sin and I read "tilting bolt" as "tilting barrel", Im not really sure about tilting bolt firearms as I havent studied them much
Drill hole in barrel
Some crude collar-type way to redirect the gas 90 degrees
Cylinder + sleeve to serve as the expansion chamber and piston
That all seems pretty doable. The hard part is making bolts, barrel extensions, and timing the whole thing
Is it mandatory to DIY everything?
ECM can go down to small calibers just fine
pic is a test on a 8 year old clone of a Prusa
with the new mandrel designs it's even easier.
the issue with throated cartridges is to make a throated chamber
To make a bottleneck chamber use the ButWhatAboutAmmo guide to make an undersize casting of the chamber shape, then use something like a stepper motor to plunge the electrode into the barrel at a rate that matches the erosion
you're free to demonstrate the viability of that
really sounds like you've never done ECM
good look getting the ammo
%3D