Buffer Weight for a 45 ACP AR style rifle

[WarPig]

So I recently built an AR-9 and bought a dedicated AR-9 buffer for it since apparently it needs to be heavier to avoid wear and tear compared to a standard AR-15 buffer.

Long story short, my dad saw my 9mm and wanted a 45 version. So I just ordered everything he will need but I'm not sure which buffer weight to use. It's a Quarter Circle 10 dedicated Glock style lower and upper combo. Would a 9mm buffer work or is there a specialized weighted tube I should use? 

 

[Jct1911]

There are really no specific weights tied to the calibers. 

In general, 9mm standard weight is 5.5oz but are made up to 7.5oz(I run a 7.5oz in my supressed 9mmAR). I believe the 45 runs around 8.5oz. A lot has to do with carrier weight as they work in conjunction. Not all buffers are created equally, I'd suggest checking out heavybuffers.com or contacting Rudy @ Macon Armory(he build lots of 45 blowback guns). 

[WarPig]

54 minutes ago, Jct1911 said:

There are really no specific weights tied to the calibers. 

In general, 9mm standard weight is 5.5oz but are made up to 7.5oz(I run a 7.5oz in my supressed 9mmAR). I believe the 45 runs around 8.5oz. A lot has to do with carrier weight as they work in conjunction. Not all buffers are created equally, I'd suggest checking out heavybuffers.com or contacting Rudy @ Macon Armory(he build lots of 45 blowback guns). 

WHOA, $150 for a buffer? The boys at heavy buffers are proud of there stuff!!

[mikegideon]

3 minutes ago, WarPig said:

WHOA, $150 for a buffer? The boys at heavy buffers are proud of there stuff!!

Well, 8.5 oz is gonna require more than 3 tungsten slugs, so it may actually require something special. Happy blowback

 

[WarPig]

17 minutes ago, mikegideon said:

Well, 8.5 oz is gonna require more than 3 tungsten slugs, so it may actually require something special. Happy blowback

 

Yeah, their website said I was going to need probably a 10 oz, that's why it was so expensive. The gun is being built to pretty much run a can on it all the time. 

[mikegideon]

Gonna be a fun gun

[hipower]

I love the 9mm carbines. Maybe a 45 is next for me.  I'll be watching and waiting for updates on this project.

[Fourtyfive]

I'm watching as well.

[WarPig]

I bought a Hahn 8 oz buffer. Last of the parts came in yesterday. Once we pick a cerakote color I'll take it in.


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[Westwindmike]

Maybe check with the folks over at TNW Firearms in Oregon. They are making the Aero Survival Rifle in 9, 40 and 45. I think it uses the same buffer for all three calibers.

http://www.tnwfirearms.com/