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A lower for an 6.8 SPC question

This is a discussion on A lower for an 6.8 SPC question within the M16 AR15 forums, part of the Rifle Forum category; I'm seriously thinking about building an AR in 6.8 SPC. Yah for my wife. Yah that's it. What do i need to know for selecting ...


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Old March 16th, 2017, 08:40 PM   #1
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A lower for an 6.8 SPC question

I'm seriously thinking about building an AR in 6.8 SPC.
Yah for my wife. Yah that's it.
What do i need to know for selecting a receiver for this cartridge ?
CL

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Old March 16th, 2017, 09:06 PM   #2
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any ar-15 lower
https://aeroprecisionusa.com/ap/enha...pper-receiver/
if your going to build a free floated barrel setup,check this one
you can also go 6.5 grendel,300 blackout,762x39.

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Old March 17th, 2017, 05:26 AM   #3
wxl
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Any AR15 lower. Can even swap the 5.56 & 6.8 uppers on the same lower. I did that on my first 6.8 upper until I got around to building another lower.

Only issue might be the buffer weight or spring (or gas port) may need tuning. Depends on the gas port sizing on the barrels. Some barrel manufacturers tend to oversize the gas port to handle light to heavy loads and then shooters find themselves putting in heavier springs and heavier buffers. Some 6.8 barrels try to avoid this and size port for specific range of ammo. You may need to fine tune the port size (drill little bit more) or use an adjustable gas block if oversized.

Have built 3 6.8s and have not had to fine tune using standard buffer and spring.

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Old March 17th, 2017, 09:58 PM   #4
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I still occasionally wish I'd gone with 6.5 Grendel instead of 6.8 SPC. If I were to do another intermediate, it'd be a Grendel or 6.5 LBC.

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