Custom AR 10 Build (also posted in General Discussion)

[rfaye7007]

Hello All,

I am new to building/assembling. I am currently in the middle of my first.

What I have:

Spikes Tactical "THE JACK" .308 DPMS lower, came with the upper (receiver).

JP enterprise FMOS High Pressure Bolt Carrier Group

JP Silent Capture Buffer Spring

PRS GEN 3 Mag Pul Stock

Timney AR-10 competition trigger (4lbs)

What I want:

JP enterprise 18" Barrel with 1:11 1/4" twist

What I don't know:

What rifle length gas system to get?

What length hand guard I should get? I just know I need to cover the gas system.

What muzzle break to get?

What optics to get?

What I plant to use it for:

I want to target shoot anywhere from 300 - 600+ yards and I would like to hunt deer with it. Hey if I get good with it, maybe even Elk.

Any advice would be greatly appreciated.

Thanks,

Rob

[D.R.D.]

Welcome!  Nice receiver    - will scare the animals for sure!  

What rifle length gas system to get?   - Probably rifle-length to keep pressures down

What length hand guard I should get? I just know I need to cover the gas system.   - 15" will work nicely

What muzzle break to get?    - For optimum recoil reduction Nathan Wright's Beast Brake seems to be the current one to beat.  Search the muzzle brake threads for links to all the comparison testing that has been done out there to explore your options.

What optics to get?  - For hunting at 600 yards you'll likely want a good field of view, so more than 15x might not be helpful in my understanding

-Why are you going for 1:11.25" twist, though?  Hunting you'll want heavier pills.  So, to stabilize them with a decent B.C. you'll probably benefit from a tighter twist; at least 1:10

[Sisco]

Welcome, the builders on this forum will point you in the right direction.  If you don't shoot more than 175 gr, the 11.25 twist will do fine.Any more take DRD's advice. Actually this is a 308AR build. AR10 is proprietary Armalite. For good values on optics, check out Primary Arms. Also the Nikon Monarch line. A 4x16 would work, actually more optic than you need at those ranges.

[D.R.D.]

Good points, Sisco.

Optics:

http://opticsthoughts.com/?page_id=623

Brakes:

http://www.thetruthaboutguns.com/2016/02/jeremy-s/308-muzzle-brake-test/

http://precisionrifleblog.com/2015/08/21/muzzle-brake-summary-of-field-test-results/

https://www.youtube.com/channel/UCfCk0LiY1gwB-BIdTYWdhcQ

[rfaye7007]

Wow, thanks guys for the feedback. Haven't bought the barrel yet, I wanted to go with a JP barrel to match up nice with my JP bolt. JP barrel at 18" has 11.25 twist. I currently shoot 165grain out of my winchester model 88...what are the drawbacks to the 11.25 twist?

[98Z5V]

14 minutes ago, rfaye7007 said:

.what are the drawbacks to the 11.25 twist?

Nothing, really. There are no drawbacks to that twist. 

[jtallen83]

I have rifles with both and see no appreciable difference with bullets from 130 to 178 grain. Each rifle has a particular velocity node it prefers with the same grain bullet but you can have that same difference in barrels with the same twist and length.

[Jetdoc]

Great receiver group and stock! I'm sure the gents here will be a great help. I started my first 308AR build in January and just finished a few weeks ago. Have fun building then shooting.