I had 1 in 12 gauge. I ended up selling it. It would not pattern buckshot and shot about 12" inches low. I tried 5 different makes of chokes and alot of different BK. There were a few other things that I didn't like about it also.
I did like how it handled, low weight, light recoil (even with buckshot) and how easy it was to clean.
They might be fine with birdshot though.
Also check the recoil numbers before you buy. Mine was a recall model, it had been setting at the gun store for 2 years. It was a simple fix ( replace the trigger group) but still a hassle.