i just bought a Factory New Magpul UBR stock. do i need to buy a buffer tube and spring or does it come with one?

Also specs on my 204 ruger build, let me know what you think:

RRA matched upper and lower
RRA LPK and NM 2 stage trigger
Magpul MIAD
Shilen 24" SS bull barrel w/matched bolt
RRA BCG and upper accesories
JP Vtac handguard or Hogue Knurled handguard (havent decided yet-suggestions?)
RRA cantilever mount or Armalite Cantilever mount or Larue (havent decided yet)
not sure on scope yet
thanks

you just need a spring and buffer it has its own buffer tube assembly

Cool, thanks;

i forgot i have a BCM Gunfighter Charging handle as well

is there a specific buffer and spring that i need-remember im a noob

The UBR uses a CARBINE buffer and buffer spring. I would start with a regular weight buffer. I have a .204 also, GREAT coyote gun. I had trouble with accuracy then found out that rapid fire with ballistic tip ammo was my problem. The  ballistic tip was melting due to the heat ( after 4-5 rounds) and accuracy quickly went in the toilet. My solution was to run 34gr BTHP. Also , my .204 copper fouled very easy the first 100 rounds or so, but you are using a much higher quality barrel so you might not have that problem. Just remember if accuracy is good then starts to decline it most likely is a copper fouling problem. Good luck

what kind of bullets were you using. I was going to use 32 or 40gr vmax. My barrel is a heavy bull so maybe heat wont be to much of a problem
thanks for the info on the stock

make sure and post some pics of your groups looks like it should be a tack driver.

i will, and i sure hope so