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Casting Aluminum Lower
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  PappaSunrise

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Posted: February 14 2017 at 4:04pm | IP Logged Quote PappaSunrise

Has anyone here tried casting a lower from aluminum and doing the finish machining to accept an upper and trigger parts? Here is an example of what I'm thinking.
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  backbencher

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Posted: February 15 2017 at 7:32am | IP Logged Quote backbencher

I've not.  Someone I know has cast quite a few in plastic.
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  PappaSunrise

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Posted: February 15 2017 at 7:48am | IP Logged Quote PappaSunrise

Do you happen to know the type of plastic he used? FRN would be the best of course but I don't know how easy it would be for the home builder to use and cast.
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  backbencher

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Posted: February 15 2017 at 10:22am | IP Logged Quote backbencher

Search on "Fruity Ghost".  Boris of the shovel AK & Iron Glock fame developed the idea.  They're fragile but cheap.  If reinforced w/ fiberglass strands, not necessarily so fragile.
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  PappaSunrise

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Posted: February 15 2017 at 11:05am | IP Logged Quote PappaSunrise

That is beautiful Backbencher! Exactly what I was looking for. Now I need to research plastics and resins and filler materials.



Here is the Fruity Ghost link
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  PappaSunrise

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Posted: February 23 2017 at 2:27pm | IP Logged Quote PappaSunrise

Well if I didn't have enough hobbies already, I have decided to try my hand at casting aluminum. I'll need to build a foundry but that's not super hard. Where I work I have access to scrap aluminum castings, so I have the proper material. Maybe one day I'll try to cast custom gun parts, one day.
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  dcorb

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Posted: February 23 2017 at 9:00pm | IP Logged Quote dcorb

I would like to cast a Tec9 lower. Problem is making the mold, been thinking of looking at Tec9 air soft guns to see if one could be used to create a mold.
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  backbencher

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Posted: February 23 2017 at 10:53pm | IP Logged Quote backbencher

I'd like to cast an 80% AR lower out of aluminum cans, but that will have to wait until post-deployment.
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  PappaSunrise

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Posted: February 24 2017 at 2:27am | IP Logged Quote PappaSunrise

Using an air soft gun is a damn good idea that I hadn't thought of, you can do lost wax casting rather easily using plaster. In fact by using the Fruity Ghost mold making method you can cast a perfect wax model and made a mold from that, and by just filling most of the holes (while leaving a locator dimple) you can cast a lower with the FCG pocket and the magwell already formed, possibly even the buffer tube threads. Guys we may be onto something here.
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  backbencher

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Posted: February 24 2017 at 6:54am | IP Logged Quote backbencher

What about the lost airsoft method?  

Pappa, just be aware, there are some difficulties w/ the Fruity Ghost method.  The casting rubber is expensive, and it's difficult to get lowers out w/o tearing.
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  PappaSunrise

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Posted: February 24 2017 at 7:01am | IP Logged Quote PappaSunrise

I'd imagine getting a wax lower out would be easier on the mold than resin, though cost and skill are still a factor. I don't think directly melting out the plastic from an airsoft frame would work well. Are there 3D printers that can print with wax? If so we could 3D print literally almost any shape without having to make a mold first.
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  dcorb

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Posted: February 24 2017 at 3:50pm | IP Logged Quote dcorb

One of my plans is lost PLA. Just have to get my 3D printers up and running.
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  PappaSunrise

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Posted: February 24 2017 at 4:23pm | IP Logged Quote PappaSunrise

I don't have a 3D printer...yet. So I can't really test anything concerning that. But if there is a reliable way to melt out printed models, we may have a golden idea here. Casting a lower receiver that will only need minor finishing, sounds great to me.
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