Questions about building a .450 Bushmaster

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I have a stripped Billet Lower , and I want to build a .450 Bushmaster . If I go with an 18" barrel on my upper , than can I still use a carbine buffer tube , spring , and buffer ? Will I be able to use an adjustable carbine stock , like a magpul UBR ? Does the 18" barrel give you any big advantage over the 16" barrel.

TIA

[Aetius]

Post that question here:

https://www.m4carbine.net/forumdispl...cal-Discussion

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Post that question here:

https://www.m4carbine.net/forumdispl...cal-Discussion

Thank you very much for your help , and link .

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Thank you very much for your help , and link .

I posted the question there , but no help .

[sva01]

http://450bushmaster.net/index.php has all the info you seek as well.