Piston ID

Bought these, measuring 4.04, so std bore(no good for me)
I thought they would be marked "std"? Can't find markings anywhere other than 265-99 on the underside.
Weigh out at 721ish grams, pins measure .984 and weigh 154ish.
I've done some searching and look like Mopar Performance ??
Compression??
Thanks
Steve