Build ar308 from scratch

[NATEWA]

Great advice, I am trying to consolidate all the stuff either from faxon barrel/bcg, and AeroP for the rest. Except i got a cheap stock/carbine buffer from PSA.

Does rifle gas length works fine with carbine buffer kit for ar308?

Hopefully so more experienced calgunners can answer your question about using a rifle length gas system with a carbine stock set up.

https://www.luth-ar.com/product/308-mil-spec-carbine-buffer-assembly/

They say it will cause reliability issues. I have a rifle length gas and rifle stock on my ar308. I also have an adjustable gas block.

[NATEWA]

colonelrhombus

Posted March 27, 2019
you'll be fine running a carbine buffer system (and by system i mean a carbine buffer, carbine spring, carbine buffer tube) with a rifle length gas block on your barrel.

i ran my rifle this way with a .308 barrel and a 6.5 creedmoor barrel and have had exactly zero issues with either set up. i used an aero M5 upper/lower combo and built everything from scratch as i do all my ARs.

https://forum.308ar.com/topic/16032-308-build-carbine-buffer-w-rifle-gas/

[rvr350]

Any opinion on handguards? I am pretty old school and hate things dangling on my weapons. In fact, most of my handguns don't even have rails. So seems like it is not easy to find a clean look, minimal piccatiny rail on handguards. I will probably put iron sights on it too. What is the best approach?

[triggs75]

Any opinion on handguards? I am pretty old school and hate things dangling on my weapons. In fact, most of my handguns don't even have rails. So seems like it is not easy to find a clean look, minimal piccatiny rail on handguards. I will probably put iron sights on it too. What is the best approach?

If you were going the Aero route then I would get their M5 308 handguard as well

https://www.aeroprecisionusa.com/m5-enhanced-mlok-handguards-gen2

Chad

[deadcoyote]

Any opinion on handguards? I am pretty old school and hate things dangling on my weapons. In fact, most of my handguns don't even have rails. So seems like it is not easy to find a clean look, minimal piccatiny rail on handguards. I will probably put iron sights on it too. What is the best approach?

[rvr350]

It doesn't look bad at all.

If I like the look of this magpul: https://www.primaryarms.com/magpul-m...e-length-black

Is there something similar that is free float? Is it a difficult task to get a d ring and front sight base gas block as well?

[ar15barrels]

Great advice, I am trying to consolidate all the stuff either from faxon barrel/bcg, and AeroP for the rest. Except i got a cheap stock/carbine buffer from PSA.

Does rifle gas length works fine with carbine buffer kit for ar308?

If you get an AR-15 RIFLE buffer tube, you will need a 308 RIFLE buffer.
If you get an AR-15 CARBINE buffer tube, you will need a 308 CARBINE buffer.
If you want to use an AR-15 CARBINE buffer, you will need an AR-10 CARBINE buffer tube which is longer than an AR-15 CARBINE buffer tube.
You could use an AR-15 CARBINE buffer in an AR-15 RIFLE buffer tube if you made a spacer to make up the extra length.
The better setup would be a A5 H4 buffer with a shorter spacer.

In ANY of the above cases, you will need a proper 308 SPRING for either carbine or rifle buffer as the AR-15 springs will not be correct.

[rvr350]

Can someone explain how the delta ring works in securing the barrel? Is it used instead of a barrel nut, like this one: https://www.opticsplanet.com/aero-pr...arrel-nut.html

The magpul moe rifle length handguard specifies that it is not free float, that means it will require a delta ring assembly to affix the handguard to, right? What kind of assembly do i need at the gas block? A FSB gas block like this: https://www.midwayusa.com/product/1003349671

or Adam's arms: https://www.adamsarms.net/standard-picatinny-gas-block

[NATEWA]

Any opinion on handguards? I am pretty old school and hate things dangling on my weapons. In fact, most of my handguns don't even have rails. So seems like it is not easy to find a clean look, minimal piccatiny rail on handguards. I will probably put iron sights on it too. What is the best approach?

https://www.jsesurplus.com/youngmfg308rifleflutedfreefloat-1.aspx

Cheap and clean looking.

[NATEWA]

Can someone explain how the delta ring works in securing the barrel? Is it used instead of a barrel nut, like this one: https://www.opticsplanet.com/aero-pr...arrel-nut.html

The magpul moe rifle length handguard specifies that it is not free float, that means it will require a delta ring assembly to affix the handguard to, right? What kind of assembly do i need at the gas block? A FSB gas block like this: https://www.midwayusa.com/product/1003349671

or Adam's arms: https://www.adamsarms.net/standard-picatinny-gas-block

[kcheung2]

I agree with this sentiment as well. Based on your last question, it seems you're unfamiliar with building any kind of AR upper. That's not intended as a dig at you, no one really needs to know how to put one together, but using 308 isn't best method to learn how to assemble an AR. Compared to the AR-15 market, the parts market for 308 ARs has less selection, less compatibility, and higher costs.

However, if 308 is the caliber you want & you want to learn by doing, then by all means go at it. It just takes more research & maybe some failed purchases. But when completed & working, 308 ARs are great no matter what path you take to get there.

[ar15barrels]

Can someone explain how the delta ring works in securing the barrel? Is it used instead of a barrel nut, like this one: https://www.opticsplanet.com/aero-pr...arrel-nut.html

The magpul moe rifle length handguard specifies that it is not free float, that means it will require a delta ring assembly to affix the handguard to, right?
What kind of assembly do i need at the gas block?
A FSB gas block like this: https://www.midwayusa.com/product/1003349671

or Adam's arms: https://www.adamsarms.net/standard-picatinny-gas-block

Delta rings are indeed used with a barrel nut like that.
They are used to retain snap-in handguards which also need a handguard cap and a FSB or gas block set in the correct location to fit the handguards.

Delta rings do not fit on LR-308 pattern barrels.
You have to use an AR-10 pattern barrel to have the correct gas block seat location to make ROOM on the barrel for a delta ring and snap-in handguards.
You would usually have a FSB pinned to the barrel as well.
Armalite used to sell AR-10 pattern barrels setup this way.

It's VERY uncommon to build a 308 AR without a freefloat handguard.

That Adams Arms block is for the Adams Arms gas piston system and would not be compatible with any type of 308.

[rvr350]

Thanks for all the helpful advice. I will do more reading and learning before building.