I was at local gun show yesterday on Jonesboro, Rd. Saw a lot of AR-15 complete upper units. Can these be changed between guns without modification. Say take a 5.56 unit off and put a 7.62X39 unit on buy just taking 2 pin out.
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In short, yes
50 Beowulf,6.8,.224.300bp,5.56,223,.22, 7.62 t
All use the multi cal or regular mil spec 556 lower
Some will use same 556 magazines.
6.8 and .224 Valkyrie use same magazine
223/556/300bo same magazine
7.62 has its own magazine
Pop the take down pins, swap the complete uppers as you please
Barrels, bcgs are different story
And bolts. At least the Valkyrie and 6.8spc use different bolts.
I keep a drawer full of them.