Its doesn't matter...AR15 springs have no effect on calibers.

Its common to “tune” a rifle by changing the buffer, different spring rates are another place where you have choices. Most aftermarket springs use a spring tension weight

@HUNTER4639 @Odb 👆

I see. Thanks much

Opps

I meant to tag another person too oh well

They'll see

You'll need a Carbine style buffer

@Aperfectghost thanks, I’ll go ahead an place an order then. I hate how small the micro buffer tube is

https://ar15discounts.com/products/nbs-mil-spec-carbine-buffer-kit-w-h2-heavy-buffer/
@Aperfectghost
Is this okay?

JP Silent Captured Spring

Check that product out

After ur build

That is an expensive spring lol

Yes to answer your question Odb, a heavy buffer is good because it, a 9mm AR is a blowback system

Yeah its expensive but you can swap it between your ARs

@Aperfectghost hmm maybe in the future. I don’t seem to need it rn, My DDM4V7 Pro has no recoil. I assume that is the purpose of that primo spring

I like the suggestion, did not even know that existed

https://www.opticsplanet.com/luth-ar-9mm-carbine-buffer-assembly-commercial.html

Heres a good option as well 👆 @Odb

This is coolest AR build I've done, it's a side folder with a quick attach dolos system

I have a jp on my rifle lower, it is smooth.. very much like it

@Aperfectghost you know if I put a rifle length buffer on my 20" 6.5 if it would cycle ok?

It's in my go bag

With my cz p07

Using a mid length buffer and it ejects around 2-3 o'clock

I think it would work

https://www.arbuildjunkie.com/choosing-the-right-buffer-for-your-ar-15/

Heres a good website for help with buffer

Issues

im here with the obligatory "are those nerf darts?"

Heavy 5oz nerf darts

Some 8oz

Crossbow that shoots buffers <:thinking:726878987837636698>

yes

I think I need some range time..its been a bit and I need to throw a few .50s down range

@Aperfectghost I did a little more research and saw that h2 might not be heavy enough, I think im going with Aero precision ar15 carbine buffer tube kit H3.

Did u see the other one I suggested

Yeah that is what lead me to do more research, it said 5.3 oz and H2 was only 4 oz or something like that. H3 is 5.4 so it should do the job.

9mm specific is 5.3 from what I saw