i have a ar lower setup for 556 but want 9mm now ??

[chillincody]

Hey guys and gals ,
I recently put together a ar pistol lower I planned on building 556 but now that I have no car im thinking about making it 9mm for use in my local indoor range . So ive been doing my research and have a few ??s im not finding straight forward answers to ..

what answers I found
- ill need 9mm mag block and mags
- and of course a 9mm upper
-need to have my 9mm bolt ramped to use my 556 hammer

what I cant find answers to
-what about buffer and spring? do I need a 9mm buffer & spring?

Im running this buffer setup from exile machines DOUBLESTAR PISTOL BUFFER TUBE (PBT) COMPLETE ASSEMBLY

any one have a idea if im gonna have to buy a new buffer setup or should this be fine?

thanks
Cody B

[MrPlutonium]

You will probably need a new 9mm buffer. They are much heavier because the 9mm uppers tend to be blowback operated and need extra mass to keep the action from unlocking too soon. The tube should be okay, not sure about the spring.

[chillincody]

You will probably need a new 9mm buffer. They are much heavier because the 9mm uppers tend to be blowback operated and need extra mass to keep the action from unlocking too soon. The tube should be okay, not sure about the spring.

Alright thanks man I guess it will be worth spending the extra cash and just dedicate the lower to 9mm. guessing to have the bolt ramped will be more $$ than just buying a 9mm hammer.