Was supposed to get an OG of 1.051...I got 1.042...should I have any concerns?...followed recipe to the letter!...It's a Porter.
No worries, it'll still taste great. Just a bit lower alcohol.
What's your recipe? We may be able to help you get closer on future batches.
If it was extract, it was probably because you didn't mix your top-up water thoroughly enough. That happened to me on my first batch, and may around here cite that as a cause of low gravity readings.
Come to think of it...I may have taken the reading right after topping it off but before I mixed it...maybe the OG was higher than anticipated...thanks gents