Buffer/ tube/ upper length compatability ar newb question

[zachseaman]

Im an ak guy taking my first steps into the delicate, picky princess that is the ar family of firearms... kidding, but I am new to this platform. If I were to put an A1 length fixed stock onto my 5.56 midlength system, what buffer/ tube/ spring combo should I go with for maximum reliability? Does this still need a castle nut and all the other stuff that a collapsible stock would need to install? Again, brand new to this so easy on the hate

[nate76239]

[zachseaman]

Right on, thanks Nate

[tonyxcom]

Actually, 'receiver extension' is the correct name for both. They just come in rifle(a1) and carbine(m4) lengths traditionally, as well as the less common intermediate(A5) length.

[zachseaman]

Interesting