Gunsmithing Proper Buffer Spring for 300 Blackout Pistol

[zenbiker]

Guys, is there a particular buffer spring that should be used with a 10.5" 300 AAC pistol upper? I have a Spikes lower with a .223 upper, and I got a chance at a the 300 barrel at a good price, so i figured Id give it a try. Any other recommendations would be appreciated as well.

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[I Am Hero]

I was just looking into this a couple minutes ago. From what I read across various forums, any 223 buffer that you are using will work for the 300 AAC as well.

 

[Killswitch Engage]

plain vanilla worked fine for mine

 

[zenbiker]

Great. Certainly makes things easier. I forgot to ask about the bolt - again, any difference?


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[Killswitch Engage]

nope. pistol length gp with standard gasblock is what i used with my 8" barrel and it cycled 178 amax subsonic perfectly.

 

[zenbiker]

Thanks Killswitch. Looking forward to this project.


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[BurnOut]

Running the AAC 9" upper on my SBR, full weight bolt carrier, and a JP SCS buffer/spring setup.

 

[Rancid Coolaid]

Not trying to be a smartass, but the answer to your question is, "the one that cycles the action reliably." Having owned and operated more than a few 300WTF over the years, there is no one recipe that always worked. It is barrel length-dependent, gas block-dependent, propellant-dependent...
Start withe cheapest part to address and move up from there. Because a certain configurlation worked for someone else does not mean it will work for you.