OG/OG6.5 Specific AR upper?

[ShootOkHuntWorse]

Thinking about building a light weight AR upper for use with my OG6.5 for fun/shooting in the mountains.
14.5 barrel?
10” handguard?
Should I be worried about over gassing the shit out of it?
Any brand specific handguards and barrels for this?

I already abuse my OGs on my AR at the range when I run out of my TMK reloads for the day, it’s gassy but I’ve done absolutely zero spring changes.

 

[ckt3]

Could look into KAK downvent bcg, stiffer Springco springs and an AGB… Riflespeed is nice but expensive. Superlative is good too and cheaper.

Could also save money by doing a BRT tube. That and a stiffer spring + heavier buffer might make a big difference for not too much money.

 

[Formidilosus]

Thinking about building a light weight AR upper for use with my OG6.5 for fun/shooting in the mountains.
14.5 barrel?
10” handguard?
Should I be worried about over gassing the shit out of it?
Any brand specific handguards and barrels for this?

I already abuse my OGs on my AR at the range when I run out of my TMK reloads for the day, it’s gassy but I’ve done absolutely zero spring changes.

What is your current rifle setup?

 

[ShootOkHuntWorse]

What is your current rifle setup?

Hilariously lame bushmaster xm-15. Straight up m4 copy boring. Factory rifle. FSB.

I really just want a shorter/lighter upper for dicking around on snowmobiles and just a throw it in the truck for plinking in the mountains. If it’s a small enough form factor to pack on the horse that would be cool but not likely given the ARs lack if sleek lines. If it ends up accurate that’s great anyway. Already shooting a 223 tikka.

 

[ckt3]

If it’s always gonna be suppressed you could check also out 11.5” uppers with mid length gas systems. I think KAK has a complete one. Pair with their downvent BCG for less port pop.

Downside is it won’t cycle without a suppressor to add backpressure.

 

[ShootOkHuntWorse]

If it’s always gonna be suppressed you could check also out 11.5” uppers with mid length gas systems. I think KAK has a complete one. Pair with their downvent BCG for less port pop.

That’s actually not a bad idea.

Another thought is should I just say screw it and go 6arc? Match ammo is same price or cheaper than 77tmks.

 

[ckt3]

6 arc is sweet but something nice about keeping the number of distinct calibers to a minimum if you’re already shooting .223

I’m in a similar boat though. Eyeing a mid length 11.5 to reduce gas and 6 arc has always been interesting to me

 

[ShootOkHuntWorse]

6 arc is sweet but something nice about keeping the number of distinct calibers to a minimum if you’re already shooting .223

I’m in a similar boat though. Eyeing a mid length 11.5 to reduce gas and 6 arc has always been interesting to me

My spare time is really limited for my hobbies. So reloading is getting more and more tedious. So 6arc being the same price for loaded ammo is really starting to interest me.

 

[ShootOkHuntWorse]

Just realized an 11.5 mid won’t work due to the Over The Barrel of the OG. That’s why I said 14.5 with 10” handguard.

 

[ckt3]

You’re right with mid length gas the min barrel length you can run with the reflex is prob like 13.9”.

With carbine gas you could do 12.5” if you’re prioritizing short barrel length. Try to approximate a Gordy carbine haha. Also reflexes and looks sick https://bgdefense.com/product/gordon-carbine-sbr/

 

[ShootOkHuntWorse]

Gordys gone man. I’ve always loved that rifle. If A2 uppers weren’t so absolutely stupid priced I would build one so fast. If the rifle ends up accurate with a good gas system and barrel I’ll probably put my triji 3-9 on it for a while.

 

[Formidilosus]

Hilariously lame bushmaster xm-15. Straight up m4 copy boring. Factory rifle. FSB.

I really just want a shorter/lighter upper for dicking around on snowmobiles and just a throw it in the truck for plinking in the mountains. If it’s a small enough form factor to pack on the horse that would be cool but not likely given the ARs lack if sleek lines. If it ends up accurate that’s great anyway. Already shooting a 223 tikka.

I meant buffer, gas length, etc.


An H2 buffer and new spring would help with the gas to face quite a bit. You shouldn’t need any of the “fixes” with an OG on a normal AR.

 

[Formidilosus]

OG. 14.5” mid-length gas.




OG, 14.5” carbine gas-

 

[benconfused]

Just realized an 11.5 mid won’t work due to the Over The Barrel of the OG. That’s why I said 14.5 with 10” handguard.

Is that because of the handguard or where the gas block is?

 

[ShootOkHuntWorse]

OG. 14.5” mid-length gas.
View attachment 1007658



OG, 14.5” carbine gas-
View attachment 1007659

That first rifle is really close to what I want to setup. Just wasn’t sure if I needed to do anything weird gas wise on the 14.5. What uppers are affordable but retain zero well? And what barrels are 1.5moa?

 

[texag10]

Gas block would for sure be an issue on an 11.5 mid, not enough exposed barrel between the shoulder behind the threads and the front of the gas block.

I'm about to put an OG 65 on an 18" rifle gas barrel with a superlative arms adjustable gas block in vent mode and might run into problems with the back of the can contacting the adjustment for the gas.

Edit: if anyone has OG65 vs aem5\ocm5 or 6 experience on a precision oriented AR, input would be welcomed. I'd eventually like a dedicated can for the 18" AR so the OG 65 can live on my hunting rifle.