Mine was smile free new condish when I bought my mk25 FDE 2. Years ago
Probably wear from proving safe before passing to a customer for handling if I had to guess since you bought the one under the glass
I wouldn't worry about it either, all sig barrels develop those smiles, and not necessarily from being fired either.
To Whom it may concern;
We do not allow firearms to be test fired prior to purchase. Any firearms that do not come to us from an authorized dealer/distributor are listed as either previously owned or used. I have currently made further inquiry into the matter with the Sig distributor and will provide upon availability; however the all mk-25 and mk-25d models received in our latest shipment do have the same wear pattern on the barrel.
I currently do not have any orders in for the SP2022. If it is an item for which you would like ordered; we can contact our distributor and see if it is an item that can be brought in so long you have the proper licensing. In addition we would require a 25% non-refundable deposit prior to the order being placed.
Sincerely,
Wild West Shooting Centre