WW2 97 Trench gun question

[Jared]

Hello,
Is it possible for a 97 Winchester trench gun sn 951968 to be WB cartouched, and have the six row heat shield? The bottom of the barrel is 42 dated and the muzzle shows no signs of a sight bead in the barrel. The shotgun looks all original to me. The receiver is US and bomb proofed on the left side where it should be. The bayonet lug is marked PAT JAN 15 & MAR 19 1918. I have read that most WW2 bayonet lugs are unmarked. I've been collecting awhile and the gun looks righteous to me. I can post pictures later if you need them. Thanks in advance,
Jared V.

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