28 thoughts on “Does Not Come With Batteries, Some Assembly Required

  1. Thanks, but no thanks. I don’t care to be anywhere near a .50cal when it barks. Even with that massive suppressor, the supersonic shock wave is hard on anyone even near it. As a long range “reach out and touch someone” it is superb, but I’ll leave that to the pro’s. .44mag is plenty of bark for my tastes.


    • Rush predicted exactly this yesterday. They were waiting for Fox to lead the way.
      I was just explaining to my wife that the alphabets calling it doesn’t make it so. We have until Dec. 8 for the electoral college to say who’s got 270plus. The unknown factor they are failing to account for is named Donald J. Trump.
      And an old bumper sticker from long ago: “More Whiskey, and Fresh Horses for My Men!”


  2. No doubt about the engineering in that can, I think you need all that length and volume to contain the length and expansion of gases in the muzzle blast the .50 cal ordnance creates, and a good suppressor design makes for a top shelf muzzle brake. Look at the massive size of the blast chamber.
    Me Want!

    Maybe one of you guys have some suggestions for me, I’m trying to make a complex bolt rotation geometry without using 3 axis CNC. Read old-timey analog machining techniques
    Got a gas impingement operated semi auto design, based on the AR system, scratched out, it’s basically a modified for the pressures and forces of the Browning .50 cal ordnance using as much of Stoner’s brilliance in the AR gas impingement he created without re-inventing the wheel, the KISS concept. Stoner’s excellent design was that all the forces except for the low inertia impulse of the bolt assembly in its rearward/forward recoiling movement, is centralized in the bolt lugs/face and barrel/barrel extension. Thats why he could use aluminum alloys and a super light weight design. It is a totally self contained circular reinforcing design.

    Having a hand screw garage machine shop I’m against a wall trying to figure out how to machine the helix for the bolt head unlock/lock rotation. One alternative instead of the helix/bolt pin ramp in the bolt carrier, the negative camming slot that the bolt pin rides in, is to put the ramp in the receiver, using a relatively long ramp, with a roller-ized bolt pin to follow the ramp. The larger diameter of putting the cam outboard from the bolt carrier centerline gives a greater and longer can profile. To my thinking this allows for use of larger width thus stringer bolt lugs, a 2 lug bolt then can be employed like a bolt action, the thicker web of two bolt lugs need more rotation than the 6 skinny lugs the AR has, I think it makes for simpler machining of the bolt head/lugs too. In my poster board mock up it suggests this is feasible, but there still is the 3 axis feature regardless because of the combined rotation and straight line simultaneous action of the bolt rotation.
    I’m hoping in this way I can get away with a simple compound radius ramp design that follows the radius of the of the upper receiver the camming slot is cut into, by simply making a fixture bolt pin with a double scribe which can trace out the actual bolt pin rotation required to unlock the interface with the barrel extension lugs. Using Dykem to highlight the cam profile, providing countour lines to machine a tracing template I can fabricate to then scribe the cam profile on the OD of a blank upper receiver tube. I’m using 4130 Aerospace tube stock. Great alloy, very rugged with high repetitive shock values, and its simple eutectic characteristics make for simple fast quench and oil bath hardening tempering.
    The bolt pin roller having an elliptical ogive to compensate for the varying angle of rotation as the bolt rotates, providing a kind of faux 3rd axis cam contact as the helix varies as the bolt assembly travels.

    I’m no engineer by any stretch but gut engineering tells me increasing the size and masses proportionally, with a much closer to the muzzle gas block and longest gas impingement tube possible, would reduce the chamber pressure and bolt release dwell impulse to safe levels. Similar to the M1 Garand and M-14 gas block almost at the muzzle end of the barrel.
    Probably have to have a way to adjust impingement impulse to compensate for the back pressure a suppressor creates.
    The sooner the pressure loading on the bolt interface is reduced where the lugs are not having to overcome internal chamber pressure the better regardless of a can, muzzle brake or clean muzzle.
    The Browning .50 cal ordnance is essentially a small cannon caliber, Browning took the .mil 30-06 and scaled up three times. Is it three times the forces? It definitely has some pretty high loadings, for a 650-780 grain half inch diameter to have muzzle velocities higher than the .308. and 6 tons of muzzle energy. Its sammi cup figures are up above 55,000, and its a lot more surface area of the case and head than a 30-06.
    Are the increase in forces then logarithmic, or exponential? Or is it based somehow on the physics theory of forces =’s energy x’s mass squared?

    I’m a nothing is impossible, always a way, glass is half full improvisational life long welder/fabricator. But not a train tool and die maker, or have any formal education, though a veracious reader, and have a terrible case of mathematical related dyslexia. So bad, had to create my own math system to get around the cognitive limitation of the dyslexia blocks.

    I’d truly appreciate anyone who has some advice for me.

    Two main objectives I try to stick to is KISS and don’t re-invent the wheel, and always employ off shelf parts or concepts. I’ve found many times simply thinking outside the box, crafty re-arainging of a present design or concept can be rewarding, and improvisational mindset gets a lot of things accomplished.
    Kelly Johnson and Smokey Yunik are inspirational legends in that vein.


    • It doesn’t have to rotate; what’s wrong with a sliding wedge-shaped breech block? Look at artillery designs used when machining was rudimentary.


      • Have to get a gander at the way the wedge functions. Remember I’m following thne KISS principle and avoiding reinventing the wheel. A main component of that mind set it to retain Stoner’s barrel extension to bolt lug lock up. Without examining a wedge block breech I imagine that violates the idea of the Stoner concept of centralizing the locking and chamber forces to just those two components, can’t think of a way in my mind to build a wedge and lock system avoiding that principle. By inference of the requirement I’d think it would require a relatively massive reinforcement block, akin to say a sliding breechblock on a 1205 pack howitzer.

        One desired feature I’m trying to keep to as light a weight weapon as possible, something which will be humped all over these WV ridges where even the goats avoid. Thats my #1 driving reason for sticking to a rotary bolt design.
        Building a single shot .50 based loosely on Thompson Center’s Contender. Waiting on funds for a Manson match chamber reamer, so the barrel blank hasen’t been turned down and cut to final length and crown/threaded, so its probably a few more lbs in its blank cylinder shape, but all the parts weighed together its 24.7 lbs, and I used 7075 aluminum and composites wherever I could get away with it to save every once possible. And to get max energy potential, its a long ass rifle, the barrel will be 26 inches finished. That seems to be the optimum minimal barrel length for the .50 cal ordnance, below that bbl length muzzle energy begins to fall off rapidly.
        Every thing in life is about balances. Went with the TC single shot design because it gives the shortest OA length of any configuration short of a bullpup design. Which has its own quirks and shortcomings Im not interested in getting into. Something about that artillery round next to my cheekbone going off just don’t work for me.

        But, appreciate you. I had researched sliding breech block designs, but the ergonomics of minuaturizing it into rifle design posed too much complexity. KISS, always KISS. I’m not a production manufacturer, I’m an old fart with a two car garage metal fab shop on a pension, ready liquid funds are always at a premium and have to choose wisely on everything. Everything welding metal fab and machine tooling, particularly raw materials are getting stupid crazy cost wise. A solid round of 4140 bar stock at 3.000 inches OD and a foot long has tripled in price in a year and a half. Some items more. 7075 billet costs more than aluminum bronze bearing stock. I cant afford to buy random lengths to get the cost savings.
        Using off shelf bits really keeps materiel bill down, like using the AR trigger/safety group, AR furniture, shopping around for a barrel blank saves enough to cover the cost of the .50 chamber reamer. Stoner’s AR design is inherently an excellent materiel minimalist weapon. No one yet has done better. Might be part of why it keeps getting better with age. Which makes sense as Stoner was an Aerospace engineer first. From my aerospace welder/tube fabricator experience the AR has all the elements of light weight critiria which is such a driving design factor in aircraft and space vehicles. As light as humanly possible, as much endurance capability as humanly possible. Definitely form follows function. When I look at thee AR, I see an SR71 and a F117, with some F16 mixed in. Its a mutt, a mongrel, but a simply brilliant mutt of a weapon how the guy used materials.

        First AR designs showed up what, about 1957-58? I was born in 58. the AR is 62 plus some years old. Looks to me like if the civilian design and aftermarket advancements in products and evolutionary refinements of the AR are any indication, it has a lot of years left, unless somebody comes up with something truly space-age great leap, my suspicion the AR is the Acme of small unit infantry combat weaponry, if only it is become such an adaptable platform.
        Look at how just the simple brown paper bag advent of the flat top and reflex sight totally changed the AR and increased its capabilities. Both where designs been around since at least WWII, the reflex-red dot optics are basically heads up analog gunsights used on P51 Mustangs and other Allied fighters. The flat top mod is a Weaver scope rail on steroids. Its how they where combined that was such an excellent advent.

        I really believe in Stoner’s philosophy of design criteria, its do-able in a home workshop, its a worthy and very pragmatic objective to reach for. Look at the 80% home built weapon and how popular its become. Maybe Stoner was a revolutionary?

        Liked by 1 person

        • Just spitballing here, an idea that came to me thirty seconds ago while I was out having a smoke.
          Would it be possible to combine the T handle of the AR design with the bolt of a the venerable Grease Gun?
          Somehow eliminate the open bolt but still retain the simple design of that Open Bolt system?
          Maybe a lever action to initially pull the bolt back?


  3. 50BMG? That would be a big NOPE. I have a cousin who was a Machinist Mate and Small Arm Armorer in the Navy. After he retired in the mid 70’s he made custom bolt action rifles as a hobby during his second carrier. He made my dad a 50 BMG bolt action single shot. When I was 20 years old I could only shoot 3 rounds before I tapped out. Dad only shot 1 round before he put it up. It could make the long shot.

    He made me a .444 Marlin single shot. That was a hoss of a gun. I gave that one to one of my younger relatives when he came of age and he has passed it down. It was very accurate with a 220 grain bullet at 200 yards and kicked like a 12 gauge magnum.


  4. Phil Carson, for a direct impingment gas-operated system without a rotary bolthead using a cam in a bolt-carrier, just suss out the Swedish Ljungmann in 6.5 x 55mm, Danish Madsen in .30-06 or Egyptian Hakim in 7.9 x 57mm and Rashid in 7.62 x 39mm, all variations on a theme, and successful. If you can’t find plans, find a friendly post-WWII milsurp gun collector. These different versions of the designs are all well-made and handle high-intensity loads from arctic lows to blazing desert temperatures with little stress to the design.


  5. The Serbu RN50. $1,200. Brand new. Simple threaded breach cap.
    I can only shoot it several times before you dread pulling the trigger.
    It is a 18lb light weight rifle, with a oversized brake.
    Just a barrel blank will cost $400, to do your own rifle.
    The Barrel is almost 1.750″ in diameter.
    Case diameter for BMG: .800″
    About .500sq inches area
    Case pressure when fired: 50,000PSI
    Force on bolt: 25,000lbs
    There’s a reason for so few 50bmg simple rifles: Very important that there’s not a failure.
    50 Cal bolt imbeds in shooters neck


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