Does anyone know if the Colt SP1 upper is compatible with a Stag Arms lower? The reason why I ask is because IIRC the A1/A2 pin sizes are different. Any help is appreciated.
For what it's worth, the M16A1 upper I got from CDNN a while back fits a stag like it was one piece of metal.
I don't believe there's an A1/A2 difference but rather a "pre Colt being PC/post Colt being PC" difference. I'm afraid I don't know when the cut off is though.
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