looking to do a 308 build, ill probably buy an assembled upper, (im aware that voids the classification of a 'build') my question lies in the buffer extension. i have a few extra 556 mil spec buffer tubes laying around, can i use one of them?

ive heard people say yes, i've seen people say no. is it a matter of what spring or buffer you use.. or are the dimensions of the tubes incompatible?

Put this in the variants section

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