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Those Marlin XS/XL7s usually accurate. Have had maybe 3-4 of them. Last one tested at around 0.75" at 100 with factory ammo.

Picked up one in 243 few weeks back and just got mate to shoot it in....

4 years old would make it a Remlin. Yes some QA issues for a time after Remington purchase, but this one still sounds fixable.... Would be surprised if it isn't.

That's a rarity - they are usually fine shooters, straight under an inch at 100m with right ammos. Possibly a dud - it happens with any make - but check the obvious things:

* Barrel connection...