What does everyone think about buffer tube on a 20 inch barrel rifle gas system? Researching whether need a rifle length buffer tube and spring or if the milspec carbine length that will work with an extendable stock will suffice. Most stuff I've read said carbine length buffer tube will work fine. I have a carbine already so guess could just build the upper out in its entirety and try it with this gun's lower to see how it shoots.
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