This is a remarkable home made survival-type .22 rifle that is chock full of ingenuity.
It may be amateur made, but its builder, who posts on YouTube as ECCO Machine, has professional equipment, and, more importantly, skills. Most parts of the rifle are machined from billets of aluminum, titanium, and ABS plastic. The barrel is a carbon-fiber-wrapped .22 barrel liner. The bolt is made of machined titanium alloy with a welded-on handle, and it has a rare feature in a rimfire rifle, forward locking lugs.
The resulting rifle is ultralight: less that 1 lb. 3 oz. The featherweight rifle stows itself into a package less than a foot and a half long.
Unlike most amateur’s adherence to the material or materials, and process or processes that they know best, ECCO Machine’s practical use of a range of materials and methods is something worthy of a major manufacturer. Plastic, carbon fiber, aluminum, and titanium are all used in places where they’re most suitable.
The only steel or stainless-steel parts are the sear, striker, spring, screws, the barrel liner only, and a modified Savage stainless mag (with a really clever and dead-simple retaining catch that is its own spring).
The bolt’s forward locking lugs lock into a barrel extension, as in an AR; the barrel extension is also made of titanium. The rifle is readily taken down without tools. Everywhere the solutions chosen show both imagination and a practical turn of mind. For one thing, he came up with a really clever way to manage the cartridge feed by making the ejector do double duty.
There’s a really neat surprise in the grip (which he doesn’t count against the gun’s 18.9 oz weight) and the carbon-fiber stock can hold up to 40 .22 long rifle cartridges. There is a nifty titanium front sight base modeled on the classic AR FSB, and a special threaded muzzle cap that’s part of the rifle folding/stowage mechanism. (An alternate threaded adapter can convert these fine threads to the threads needed to attach a suppressor).
This video shows many more details of this intriguing firearm.
One of these should be built into ever ejection seat on every combat jet. Heck, we should build one into the RV-12.