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Help With Dimensions


PopRocket123
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I've got a SCAR H project that needs some 3d printed parts but I have no way of measuring them. The first is a replacement gas plug which was missing when I got it and the second is the threads from an M4 lower receiver for a buffer tube adapter if you know the dimensions for Fusion 360 or where to find them that would be a big help thanks. 

cybergun-vfc-fn-scar-h-gbbr-tan.jpg

223lower-80-percent-lower-ar-15-no-engraving-black-anozdized-2-800x800.jpg

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I'd get myself some callipers if I was you. Comes in very handy for all kinds of things. 

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  On 12/07/2020 at 21:37, qyuubi786 said:

I'd get myself some callipers if I was you. Comes in very handy for all kinds of things. 

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Already got a very nice set. I just can't get in to measure the threads an I don't have the part to measure for the gas plug

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  On 12/07/2020 at 21:54, PopRocket123 said:

Already got a very nice set. I just can't get in to measure the threads an I don't have the part to measure for the gas plug

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i'll measure up the one on the f2000 for you tomorrow, hopefully you can measure it's socket see if it's the right size.

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  On 12/07/2020 at 21:56, Adolf Hamster said:

 

i'll measure up the one on the f2000 for you tomorrow, hopefully you can measure it's socket see if it's the right size.

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Great thanks. If I need to I can just scale it up

  On 12/07/2020 at 21:38, Ropeyshep said:


And a thread pitch gauge. They are cheap and amazingly handy. 

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Will that work with buffer tube threads? They're very deep and different to standard sizes of threads

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  On 12/07/2020 at 22:06, PopRocket123 said:

Great thanks. If I need to I can just scale it up

Will that work with buffer tube threads? They're very deep and different to standard sizes of threads

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How are they different? Pitch gauges give you number of teeth per mm and various Whitworth, AF and suchlike old timey pitches. Threads are threads, nothing uses a completely unique version of them. 
 

These threads (🧐 sorry ) seem to suggest a 1 3/16” 16tpi threadform for that stock tube  thread on an AR15 which would seem to be the same fitting as a SCAR. 

 

http://chaski.org/homemachinist/viewtopic.php?t=76344

 

https://www.ar15.com/forums/ar-15/What_is_the_thread_pitch_on_a_buffer_tube_/118-263144/

 

Pick up a dirt cheap TPI and metric versions for your future use:

 

https://www.amazon.co.uk/sourcing-map-Thread-Cutting-Measuring/dp/B07TXZTC6B/

 

https://www.amazon.co.uk/gp/aw/d/B07PDG5ZML

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  On 12/07/2020 at 23:17, Ropeyshep said:


How are they different? Pitch gauges give you number of teeth per mm and various Whitworth, AF and suchlike old timey pitches. Threads are threads, nothing uses a completely unique version of them. 
 

These threads (🧐 sorry ) seem to suggest a 1 3/16” 16tpi threadform for that stock tube  thread on an AR15 which would seem to be the same fitting as a SCAR. 

 

http://chaski.org/homemachinist/viewtopic.php?t=76344

 

https://www.ar15.com/forums/ar-15/What_is_the_thread_pitch_on_a_buffer_tube_/118-263144/

 

Pick up a dirt cheap TPI and metric versions for your future use:

 

https://www.amazon.co.uk/sourcing-map-Thread-Cutting-Measuring/dp/B07TXZTC6B/

 

https://www.amazon.co.uk/gp/aw/d/B07PDG5ZML

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Ok thanks. They just looked deeper than normal

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ok so i had a look at the f2000 gas plug.

 

the dimensions to check for the hole are 10.5mm diameter by 12mm deep:

image.png.b2b5ffca5d5b1f852b5b25bd54cc3f8c.pngimage.png.6964834afa296ffc4a5876f7465c194c.png

 

solid edge has a nasty habit of exporting .stl files with the units in inches, so some re-scaling may be necessary.F2000 gas plug.stl

 

F2000_gas_plug.stlFetching info...

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  On 13/07/2020 at 10:06, Adolf Hamster said:

ok so i had a look at the f2000 gas plug.

 

the dimensions to check for the hole are 10.5mm diameter by 12mm deep:

image.png.b2b5ffca5d5b1f852b5b25bd54cc3f8c.pngimage.png.6964834afa296ffc4a5876f7465c194c.png

 

solid edge has a nasty habit of exporting .stl files with the units in inches, so some re-scaling may be necessary.F2000 gas plug.stl

 

F2000_gas_plug.stl 3.97 MB · 0 downloads

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Just checked this out and it's a perfect size. I guess FN reuse parts between guns

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  On 13/07/2020 at 18:38, Adolf Hamster said:

 

guess it would make sense given it's just a gas plug.

 

that stl file work ok?

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Yep loaded no problem. I've send it off to get printed out with the rail extension

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I was just about to break out the scar’s gas plug to measure! Saved me a job 😂

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