Something is off.
Serial # and barrel length don't seem to match up.
The NFA of 1934 sealed the fate for the Winchester Model 94 Trapper production.
The highest verified Trapper documented is S/N 1330740 (April 1942) and it is a 30 WCF with a 16-inch barrel.
Originally called Baby Carbines and factory original barrels were available at extra cost , 19", 18", 17", 16", 15", 14" and even 12".
Winchester referred to them as Special Short Carbines) they are exceedingly rare, were never cataloged and were ultimately discontinued in 1933.
Limited 16" were produced after 33.
Most trappers had saddle rings, but the most authenticating feature is their fore-end wood, which measures 7¼"—1" shorter than a standard carbine fore-end.
In addition, the front sight bases are forged to the barrel, not dovetailed or soldered .