03-09-2012, 05:54 AM
sneaky one Wrote:Soj. I remember reading an article,, where the upper was AR 10-15 but all the parts interchanged- .556---30-06... I'll see if I still have that rag. Maybe it's the same deal., The orig. designer sold the idea off.... How cool would that be???? One upper for ALL the diff. rounds-long or shorty's ?I remember someone having a hybrid upper that had an R25 barrel extension and was shaved and short to match a regular AR lower. We argued about it a long time ago for using hot rodded Grendel rounds. Maybe that one? Mack Gwinn also has his MGI upper for .308 that mates to the MGI modular lower with (IIRC) an FAL magazine....