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Discussion Starter #1
I came on here about a month ago while looking for a better mount than the bridge mount for the p22. no one makes anything. so I designed one for the 5" model to mount to the barrel shroud just ahead of the slide where the compensator weight or whatever its called is usually mounted.

I bought a caliper gauge to measure everything to the .0001", I drew the mount out on a free cad program on emachine website. I exported the image to a different website called shapeways( a 3d printer) and had them make me a plastic mock up of the design for $35. I got it today and put it on to see how it looks and works. so far so good. the plastic is too weak for actual use but it serves its purpose to test shell ejection problems which is my next step. hopefully they eject with being blocked by the weaver rail.

I went with the weaver instead of piccatinny because it was shorter in height and is easier to machine. That is the final stage to have this mount machined out of T6 aluminum. i could use steel but i dont think the extra weight and rigidity is needed for this .22 the walther top point II sight I am using is about 5 or 6 ounces and thats on the heavier end of laser optics, the $300+ optics are like 1-3 ounces.

attached is the images of the plastic one made by shapeways but their printing tolerances are +/- .003" so the hole for the barrel shroud is a bit to small and causes the bottom of the mount to appear flarred out when mounted, of course its not a problem to test function but its details that bother me. you can see this in the photos.

anyway i have the cad drawings saved as a pdf file if anyone wants them. you are free to modify or use them as is.

I will update this post after I test the shell casings ejection.

after that I will find a machinist to make the mount out of aluminum, I have started to price it out and its expensive to get it made, most of the cost is for the machinist to setup cnc equipment to cut the design out with a 3 or more axis mill. so far quotes have been around $275 which is about $200 more than i want to spend but I guess theres no way around it. at least it would be a solid mount, more stable than the bridge mount on the plastic frame of the gun.

A quick note about the design, the front part that grasps the barrel shroud was intentionally made shorter than the barrel nut. the barrel nut is thicker than the shroud and would require more machining if I made it long enough to cover it. I know it would look cooler if it covered it instead of the nut sticking out the front but it serves another purpose. when breaking the gun down for cleaning the shroud pulls off the barrel with the mount still attached and unmoved so if the shroud goes on exactly the way it came off there would be no rezeroing the sight. That compensator weight thing needs to be spun upward and back to expose the barrel nut on my gun.

I am having fun making this work hopefully it does and others might use it for their gun. BTW I couldnt find any other examples like it but if anyone else has please let me know before i spend the money to machine it.
 

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For some reason I can't load your pictures. All I get is a black page. Nevermind, guess I wasn't logged in. Now to have a look. M1911
 

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an7h0ny, that is a great concept. At last a real engineer. Two items of concern. I would clamp the device on the pistol as it and without the sight. Fire the pistol to make sure cases clear the rail. This will be very important. The second issues it stabilization of the attachment. The stock Walther barrel stabilizer is difficult to clamp on the barrel sleeve and make it maintain it's position. I even used to clamp mine on making sure there was no lubricant under it. Finally it stretched the metal too far and would no longer clamp tight. S&W sent me a new one but it it would not stay put over a few thousand rounds.

I really like your idea of shortening the mount so the barrel sleeve can be removed without disassembly of the mount. That should eliminate having to re-zero each time you remove slide for cleaning. :) M1911
 

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that's pretty sweet!!

it may cut your costs to get lengths of pre-made picatinny rail and just have the clamping block machined, using a couple of countersunk (and loctited) screws to hold the two together.


1917-1911M ----- maybe dimple the shroud like for an AR gas block? maybe don't even split the thing---just drill the hole and hold it on with some dimpled set screws........
 

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There is nothing on the market like your concept 0ny, other than the Walther mount which works fine as far as zeroed accuracy goes but places your red dot way up there, too far up for a plinker in my opinion, requires you to remove it and stabilizer for field stripping and won't stay tight. I don't see why you can't test the spent case with your mock up. Also, what would a dozen of them cost. I might be interested in one of these. Don't have a 5" barrel but I can get one. Looks a sight better than the stock long barrel P22. Good concept. M1911



I mean, I used to wear a sack over my head when firing this so folks wouldn't recognize me.
 

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that's pretty sweet!!

it may cut your costs to get lengths of pre-made picatinny rail and just have the clamping block machined, using a couple of countersunk (and loctited) screws to hold the two together.


1917-1911M ----- maybe dimple the shroud like for an AR gas block? maybe don't even split the thing---just drill the hole and hold it on with some dimpled set screws........
That is a good idea too. What if the whole device was molded polymer, might cut cost even more. And, what about attaching a rail to the existing stabilizer, chop some of the length off to expose the end of the barrel nut, thread the stabilizer. Red dots are very accurate. M1911
 

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Discussion Starter #8 (Edited)
1917-1911m, i designed my mount to grasp the barrel sleeve similar to how a scope ring grasps the scope tube, it will be solid and damn near impossible to move under recoil and use. the stock stabilizer has like two leafs that wrap around the sleeve and they stretch out over time i think they did this on purpose to accomadate a wide variety of barrel sleeve diameters, its saves on cost of machining each piece to fit perfectly by letting them stretch out to fit. I am testing ejection with the mock up tomarrow, i dont have any spent cases laying around to try it so i have to hit the range and fire it. i was gonna shoot it in my back yard but my neighbors are always around.
 

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Yep, I see prezackly what you are doing. Just saying that staying place with a cold, hot, cold, hot, cold, hot barrel sleeve was always an issue to me with my 5"er. Sucker wouldn't stay in place. Even with the barrel nut which was never designed to hold it in place, just position it. The barrel sleeve is indexed so it should go back on in the same position each time.

Comments....While it looks good, do you need the notches all the way to the end of the muzzle. Part might need more strength where it moves from the front clamp to the rail. You could eliminate some notches to accomplish this.

Round off the edges on the front. That will make the part look smaller and I think nicer when you get to the next stage.

Make sure that the recoil of firing does not deflect the rear end of the rail into the ejection chamber where the slide might hit it. You can check this without the scope installed when you test fire for ejection tests. With a scope installed there is likely to be even more deflection of the rail.

I see no problem with removing some material from the right side of the rail above the ejection port if this area isn't needed for clamping the sight on. I like where you are going, only testing will tell if it will work or if the rail needs to be higher. M1911



Then I can put one of these on it. Not my pistol picture, just one I grabbed from back in one of my threads regarding how to mount a small red dot.
 

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Discussion Starter #10 (Edited)
no jams

shot 90 rounds today with the mock up and no jams or stove pipes everything cleared. I had forgot that I stopped the rail just before the ejection port when the slide is all the way back during firing. the front sight blank wedge helped keep the rail from flexing down to hit the slide which I was worried might happen because its so flimsy. Plastic sucks.

Machinist starts tue or wed and said it wouldnt take long at all, hes gonna thicken the rail just underneath it a bit to ensure it wont bend with weight on it. should be done before christmas :)
 

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I don't know how you protect an idea like this in case you might want to produce and sell. The first guy on the market with a good price seems to work but patents are still available. Pat Pending seems to be on everything. Doesn't mean you have a patent, doesn't mean you will get one, doesn't mean you can patent the whole concept, perhaps only the unique mount, if, it is unique. I give away all my ideas. :p Yep, still poor too. You have some R&D to do. Something some gun manufacturers don't seem to have time for anymore. Keep us posted. M1911
 

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I'm loving this thread. Very original idea, I'd get a patent for it too if I were you.
 

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You should ask for a couple of volunteers as beta-testers for your product. 1917 comes immediately to mind.
 

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Discussion Starter #14
thanks everyone

thanks for the praises, but I cant tske all the credit. I got the idea from someone elses post on here while i was reviewing them, looking for mount tlike this one.

stay tuned
 
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