Short update - No explanation about how the 16 was mistaken for a 28. But he did send back a short message...(quote)"Send it back if you don t want it. I will refund you money as long as the gun is in the same condition."

Good enough for me at this point. I'm sure the shipping won't be included but that can be added to the cost of "the learning curve" on my end.

Thanks for the feedback. I'll update if the transaction steers in another direction.