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Home built AR upper?
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  backbencher

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Posted: March 12 2017 at 8:21pm | IP Logged Quote backbencher

Lol!  Well done!  That lowers the cost of a 9x19mm conversion by $100!  Did you cut the ejector & mag catch slots before you baked it?
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  PappaSunrise

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Posted: March 12 2017 at 8:32pm | IP Logged Quote PappaSunrise

I milled the slots after baking. This polymer clay is easily sanded and drilled/milled once hard.
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  backbencher

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Posted: March 13 2017 at 2:58am | IP Logged Quote backbencher

Do you have a link to where you got the clay?  That looks like the least expensive mag block solution for the AR.
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  PappaSunrise

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Posted: March 13 2017 at 6:22am | IP Logged Quote PappaSunrise

I bought it at a craft store for like $3. I probably got it at Michaels. It's called Sculpey III. I read that Super Sculpey is harder than this.
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  Paraquat

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Posted: March 13 2017 at 6:58am | IP Logged Quote Paraquat

Bravo!
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  backbencher

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Posted: March 13 2017 at 9:08am | IP Logged Quote backbencher

Ok, I've heard of Sculpey.  Look forward to the range report on that ejector.  Pretty clever of you to use the magazine to limit movement of it.
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  PappaSunrise

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Posted: March 13 2017 at 9:56am | IP Logged Quote PappaSunrise

After a few hundred rounds I expect a little ejector wobble. But since I have three pins holding it in place I don't think it will ever just fall out. Once I hit the range I'll report on its durability. It just snowed again but once it warms up I'll do some testing.
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  backbencher

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Posted: March 13 2017 at 11:02pm | IP Logged Quote backbencher

What is the ejector made of?  Did you heat treat it or harden it after cutting it?
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  PappaSunrise

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Posted: March 14 2017 at 12:17am | IP Logged Quote PappaSunrise

It's just mild steel. I made one out of a high speed steel planer blade but it was too hard to work with even after annealing part way. This should be fine as it's just touching the soft brass and does not rub on the bolt.
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  backbencher

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Posted: March 14 2017 at 10:28am | IP Logged Quote backbencher

Hmm.  Maybe I could Dremel that, lol.  Someone on another forum has threatened to give me video classes in Dremeling after seeing my work.  
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  PappaSunrise

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Posted: March 14 2017 at 10:32am | IP Logged Quote PappaSunrise

Lol well I've heard guys say that the Dremel is a 13 year old boy's favorite tool. I tell you what, this polymer clay can be sanded, drilled, and cut very easily with a saw. Take some time with hand tools and a vice and you can make a lot of crap. It's how most get started.
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  backbencher

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Posted: March 15 2017 at 11:07am | IP Logged Quote backbencher

Yes, now that I finally have a workbench, I desperately need a vice.
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  PappaSunrise

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Posted: March 15 2017 at 12:44pm | IP Logged Quote PappaSunrise

Any vice is better than no vice, but a good vice is better than a cheap one.
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