JP SCI-20 6 ARC 18” build

Cswedeen

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Dec 15, 2019
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El Paso, TX
Finally got all the parts in on this build and thought I’d share the build and process with you all.

Backstory:
Father-in-law was looking for a deer gun/yote gun in NW Minnesota, and asked me to build a top tier lightweight gasser. We both have JP parts in other ARs and love them, and he’s wanted a JP rifle for awhile. He decided he wanted 6 ARC, and chose 18” to remain wieldy while suppressed yet retain enough velocity for long range. Chose a VX-6HD 2-12 for the optic- clear glass and very lightweight. Tried my best to convert him to a FFP tree reticle to take full advantage of the 6 ARC ballistics but no luck, he likes his SFP duplex for deer. Added his SilencerCo Omega to top off the build.

Parts:
Receiver set is the JP SCI-20 side charge with a Proof 18” 6 ARC carbon barrel. Paired with a JP LMOS BCG, JP agb, Geissele SSA-E trigger, PRS Lite stock, and Leupold VX-6HD.

Experience:
Ordered most parts from JP, 4-6 week lead time and they had it shipped by week 5. Very helpful guys as well. Hardest part to get was the barrel, found a lgs with one thanks to help from a Hide member.

Assembly:
Putting it all together was fairly straightforward aside from the barrel install, which is a bit more in-depth and requires a torch to heat the receiver before the barrel will seat. Great video on YouTube covering this in depth. Very pleased with the semi-monolithic upper from JP. Combined with the heat fit barrel extension it really locks up like one solid piece. Additionally, installation of the MK3 handguard is greatly simplified with the SCI-20 upper, reducing the installation and set time of the barrel nut otherwise required.

Rainy day today, but will try to get out tomorrow and see how she shoots!

*Update*
She shoots. Really really well. 6 holes in a 1” bullseye at 100 yards
IMG_6270.jpeg
 

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Last edited:
Very nice. 6mm ARC is the next/new caliber that I intend to

Finally got all the parts in on this build and thought I’d share the build and process with you all.

Backstory:
Father-in-law was looking for a deer gun/yote gun in NW Minnesota, and asked me to build a top tier lightweight gasser. We both have JP parts in other ARs and love them, and he’s wanted a JP rifle for awhile. He decided he wanted 6 ARC, and chose 18” to remain wieldy while suppressed yet retain enough velocity for long range. Chose a VX-6HD 2-12 for the optic- clear glass and very lightweight. Tried my best to convert him to a FFP tree reticle to take full advantage of the 6 ARC ballistics but no luck, he likes his SFP duplex for deer. Added his SilencerCo Omega to top off the build.

Parts:
Receiver set is the JP SCI-20 side charge with a Proof 18” 6 ARC carbon barrel. Paired with a JP LMOS BCG, JP agb, Geissele SSA-E trigger, PRS Lite stock, and Leupold VX-6HD.

Experience:
Ordered most parts from JP, 4-6 week lead time and they had it shipped by week 5. Very helpful guys as well. Hardest part to get was the barrel, found a lgs with one thanks to help from a Hide member.

Assembly:
Putting it all together was fairly straightforward aside from the barrel install, which is a bit more in-depth and requires a torch to heat the receiver before the barrel will seat. Great video on YouTube covering this in depth. Very pleased with the semi-monolithic upper from JP. Combined with the heat fit barrel extension it really locks up like one solid piece. Additionally, installation of the MK3 handguard is greatly simplified with the SCI-20 upper, reducing the installation and set time of the barrel nut otherwise required.

Rainy day today, but will try to get out tomorrow and see how she shoots!
How do you like the side charger? Just ordered pretty much the same stuff as you from JP. Mine will be built around a 16" Proof 300 BlackOut barrel.
 
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I love it, especially in a precision rifle role. Reason being it is easy and intuitive to manipulate while prone, and eliminates the t-charging handle (on the SCI-20 and LRI-20 variants) which in my experience lessens gas to the face when shooting suppressed. The charging handle placement is not as ideal for a run and gun setup as say a SCAR, ACR, or Bren due to the limitations of the AR platform, but it works quite well none the less. I’m sure you’ll be happy!
 
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