1/2 scale ar??

[Collector98]

So guys I was looking around online and came across someone that built a 1/2 scale ar and I thought that would be a fun idea for my next project but i have a few questions hopefully some of you may be able to answer!

Is there any place I could rent the use of a a CNC machine or have someone make the upper, lower and buffer tube?

Could you simply take cad files and cut the dimensions in half or would it be too thin/weak?

Would it even be legal to make something that small?

And finally where would I even start a project like this??

Here is link to the original project. https://www.thehighroad.org/index.php?threads/1-2-scale-ar-15.763054/

 

[Pinecone]

If it is functional, you would have to write the CNC program, as per the BATFE.

 

[protegeV]

If it is half scale wouldn't it be way too short and thus an SBR and probably illegal in MD due to <29"

 

[j_h_smith]

So guys I was looking around online and came across someone that built a 1/2 scale ar and I thought that would be a fun idea for my next project but i have a few questions hopefully some of you may be able to answer!

Is there any place I could rent the use of a a CNC machine or have someone make the upper, lower and buffer tube?

Could you simply take cad files and cut the dimensions in half or would it be too thin/weak?

Would it even be legal to make something that small?

And finally where would I even start a project like this??

Here is link to the original project. https://www.thehighroad.org/index.php?threads/1-2-scale-ar-15.763054/

This isn't a beginners project. If you read the entire thread, you will find that he can't get enough spring pressure to ignite the round. I thought he'd have that problem when I started reading the thread.

There's a lot more to this project than just dividing all of the drawing by 2. A bit more engineering needs to be put into this before it's built.

There was a lot of wasted time and money that went into that build.

It's cool and if he wanted to make it a non-firing model, that would have been great. I think even with his vast amount of experience and skill, he'd tell you there's a lot more that should go into this than just machine shop work.

However, if you try, I wish you nothing but the best of luck!

 

[Collector98]

Thanks for the input guys! I think ill just save this project for a day when I have more experience

 

[thumbert]

Thanks for the input guys! I think ill just save this project for a day when I have more experience

You could always build a 1.5 scale version of a 1/2 scale AR.

 

[protegeV]

You could always build a 1.5 scale version of a 1/2 scale AR.

So a 3/4 scale AR?

 

[thumbert]

So a 3/4 scale AR?

I didn't say I was good at math.

 

[Boxcab]

So a 3/4 scale AR?

No, no,no... that's a .75 caliber and not legal in rifled barrels!




.

 

[Sundazes]

So a 3/4 scale AR?

no 3% scale

 

[cougar70]

And if you read the entire thread, somewhere he mentions just how many hours he has put into that 1/2 scale "model", it's something in the hundreds of hours!!
With that said, it is an incredible accomplishment and testament to his machining capabilities!
Brian

 

[eruby]

Photo w/ regular AR on page 10, post #243.

Nice!!!

 

[3paul10]

a 1/2 scale HBAR would have an M4 cut.

 

[teqmod]

Biggest issue I see is where do you find the 2.78 to feed it?

 

[protegeV]

Biggest issue I see is where do you find the 2.78 to feed it?

Lol, I thought the same thing but he's using 5.7x28 which is hilarious bc technically the projectile is larger than 5.56. Bigger around anyway.

 

[Pinecone]

No, 5.7 uses a 5.56 projectile.

But is half scale, that still makes it equal to a .426" bore.

So technically, it is a 1/2 scale .458 SOCOM AR.

 

[pbharvey]

Photo w/ regular AR on page 10, post #243.

Nice!!!

Thanks, I didn't have 10 pages worth of patience.
Pretty amazing.

 

[Boss94]

It's very cool !! He has a lot of spare time on his hands!!

 

[outrider58]

I prefer 2 x 1/2 scale versions...

 

[Boom Boom]

Legality aside, don't see the point of half scale. You'd probably end up with .22LR horsepower at best.

Much better to spend the time and effort on a double-scale cannon. The big stupid grins it gives will be priceless.