.357 Magnum Slam Fire Carbine Build

slam fire carbine build

Okay, so you asked for it, and you got it. I reached out to YouTuber Royal Nonesuch to get his build info on the slam-fire .357 Magnum carbine that we featured a couple of weeks ago. He pointed me to a little known video of his from when he made this awesome little carbine, and I thank him for it.

I say little known, because, when compared to his other videos, this one has a low number of viewers on it. Here it is:

Before you watch the video, let me give you a bit of a disclaimer. I’m not sure what the gun laws are in all 50 states, so make sure you are “allowed” to build something like this in your home state before you actually start making it. We don’t need you violating any laws and blame us for it.

Moving on…


Sadly the sound quality on the video is not all that great, but this video was done almost two years ago before he knew any better. Anyway, here are some of the highlights of the video:

  • He used a .357 magnum carbine length barrel, which means that it was already rifled by the time he got it. Rifling is essential in firearms for a couple of reasons. But, based on the type of firearm you’re making, you must have rifling per the NFA. Plus, it’s good to have the extra bullet stabilization to have a more effective gun.
  • He said that the barrel he used fit perfectly inside the buffer of an AR-15 butt-stock he had on hand. I want to caution you here, to make sure that the OD of the barrel, will slide into the inner diameter of the buffer. His fit, but they may not all fit. Of course, a bit of creativity will get you around this, if it is off.
  • He went on to say that he would not share all of his secrets, which is a bit obnoxious. However, I do see the point here. This is a way for him to protect himself just in case some nut-job goes on a killing spree. It wouldn’t be an effective killing spree machine, but I get his point. You need to have some sort of brain capacity in order to make it all work.
  • Some things to keep in mind, is that some of the parts need to be modified a bit to work. Take a close look at how the grip is mounted with the u-bolt, and look at the u-bolts themselves. They’re different. Finally, he says that the firing pin is fixed. I’m not sure exactly what he uses as the firing pin, but I did notice one of the parts (the cotter pin) from the beginning the the video that I cannot find a use for, other than for a firing pin.

Parts List, based on what I see:

  • Barrel
  • Butt-stock
  • Screw
  • Bolt
  • Two U-Bolts
  • Cotter Pin
  • Optic
  • Optic Mount
  • Contraption to hold the firing pin (cotter pin?)

If you need any of those materials be sure to check this amazing outdoor retailer, perfect for any gun enthusiast. That’s about all I’ve got to say about this carbine. I do want to point out, however, that when he filmed this video, he was a kid, likely without a lot firearms experience. Keep that in mind before you decide to pick apart anything he may have said wrong. He’s got more skill in making guns than I ever will. And for that, he’s earned my respect.

Do you want a gun that will never be taken away and never run out of ammo? Check out one of my favorite weapons.

Sound Off Gun Carriers! Let us know what you think about this build, and if you plan to build one, too. Also, let us know what you think he used to hold the firing pin in place and how to combat any spacing issues. Then make sure you like Gun Carrier’s Facebook page.

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4 Responses to :
.357 Magnum Slam Fire Carbine Build

  1. rabidrex says:

    I didn’t make eye contact with the weapon…I didn’t want to embarrass it.

  2. JJM123 says:

    Appears to me that the large bolt with 2 nuts is the firing pin. Lathe or grind a dull point on the bolt. The nuts would keep the bolt centered.

  3. Vanguard says:

    With concern for safety, he refuses to make eye contact with the weapon, however, he will put optics on it and totally expose his neck/jugular. smh

  4. John A. Yarbrough says:

    Moron !! You don’t remove a round that did not fire (just a primer or not) for 30 seconds. On the second fire attempt he opened it up right away it hit the ground and he picked it up. I had a student eject a round immediately after pulling the trigger and it not firing. Unfortunately it was what they call a hang fire and 5 or 6 seconds later when I was trying to swipe it off the table it went off. I still have brass in my hand, so I don’t support ignorance I support safety !!

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