When I saw them advertised, I knew I had to have one.
Then I saw one.
To say they screwed it up would be an understatement.
Remember, this is an "official" factory gun.
So, here is the issue:
The original WWII Ithaca Trench guns were BLUED. Not parked, not "M&P". They were blued commercial guns. They had another distinctive feature - they are SOLID FRAME. The barrel does NOT have the 1/4 turn removal feature.
The replicas are parked like the Viet Nam issue guns.
The problem is, the VN guns are marked "U.S." on the right receiver, NOT the WWII markings as on the replicas
Also, the bayonet adapter, specifically the handguard portion, is just not right. It is not made right, it does not look right.
Compare to the Chinese WWI M97 trench gun replicas, they are pretty much an exact copy. They sold new at about $400, and have started to become collectible in their own right, now bringing about twice that in new condition.

The 37 trench replica was a great idea, but sadly it is very poorly executed.