Automatic zip gun (homemade)- final version

DISCLAIMER : This video does NOT contain plans, ratios or other information that could be useful in any way to a person attempting to build a similar weapon. Such information is freely available on the internet anyway.
Reproduce at your own risk, especially if doing so is illegal in your country.

This gun is an open bolt, direct blowback operated, entirely homemade firearm and is chambered for the .22 lr cartridge. It is fully automatic simply because it simplifies the design of the trigger. It can easily be fed single rounds, and works with most single stack magazines, commercial or homemade. It's designed to :
-cost less than 30€ in materials
-be built out of mainly standard steel tubing in a day by a single person
-not require any machining

Also, it does not require welding. Silver welds can be replaced with cold epoxy resin (jb weld). The weapon in this video exclusively uses epoxy. For 30 rounds and more magazines, the barrel requires silver welding because of the temperature it reaches.

The design was inspired by the work of Mr. Philip Luty, aka the home gunsmith, who has been successfully experimenting with similar contraptions during the past few years.

Because its case is small in comparison to the amount of powder it holds, the 22 lr creates nearly 2 times as much pressure as a 9mm round. Smaller cartridges are NOT safer; a .22 gun will blow up in your face more easily than a 45acp. However, using quality steel tubing makes these guns reliable.

Category:

Howto & Style

Tags:

• building
• homemade
• automatic
• zip
• gun
• 22
• long
• rifle

[mccauley404]

5:56 lol ehehe

Your rate of fire is about 1000 rounds/mn, could reduce it with another spring for the bolt. Or better for safety, locked breech. You have the skill to do it. Gas operated firearm just like the AK47 or the M4.

[OldDirtyRatbastard]

@mccauley404 The limitation is with the power of the cartridge. This is the heaviest spring (for 3 cases length recoil) that a .22 will push back reliably, and thus this gun is in the lower end of the possible fire rates.

A locked breech is not supposed to slow down the action, only as you say to provide safety by ensuring that the gases vent fully before cycling. I have a similar auto carbine with a 45cm barrel and no locked breech which works, so it is completely unnecessary here.

[OldDirtyRatbastard]

@mccauley404 I can tell you from testing that the high-velocity 40grs .22s can work in direct blowback with barrels up to 70-80cm, provided that you use a bolt heavy enough. Even then, it never goes under 800 rpm.

[rockergod789]

i could probably make something similar to this, given some time and materials...

[OldDirtyRatbastard]

@rockergod789 Anybody could, that's the point of the video.

[Ki113r210]

@pombos007 because it has room to move foreward, to less pressure is put on the rim. when the round is chambered though, the bolt hits it and all the force is applied to the rim, so it fires off. this is why your not likely to set off a .22 by dropping it, but if you lay it on something hard and smash it with a hammer, it probley will

[masonnf1]

I've made 3 guns before, all single-shot. two of them were .22's and the third is a .410 handgun. I plan to make a full auto next with your video as a base. I will probably make it 9mm.

[Eatherbreather]

What I've always wanted to know is, what, if anything can be done to slow the rate of fire down to a more manageable rate. Is it stiffer or lighter recoil springs? Heavier/lighter bolts? Longer bolt travels or what? Does using lower velocity ammo help? What about blanks?Any and all ideas welcomed.

[retrokinetik76]

Only if he had a lathe and milling machine

[Nitricthunder]

Impressive

[akompsupport]

outstanding work. Thanks for posting this informative video!

[notanotherCoDfan]

what brand of mags are you using?

[Wrestlerdude126]

Love it can u show how 2 make it w house held items

[JohnWelsch]

Where do I find plans, ratios, and other information?

[penguin99ify]

I made two of these in the late 70's, one in 9mm and one in .22 cal. The 9mm was easier to build and more reliable because STEN mags were plentiful and cheap. The .22 cal was finicky and I was unable to find a suitable mag (without having feed problems). The latter gun had a square bolt with a upside down "U" shaped recess on the face and grooved underside to catch the round without touching the mag lips. ROF was estimated at 1,000 to 1,100 RPM. The video brought back fond memories...thanks.

[jstefa2]

@terminator0405 short answer... yes :)