Does it come with a battery and charger?

The C1 suffix means it is sold as a kit with a 20V lithium-ion battery and charger. Confirm the pack size in the box before buying if runtime matters.

What size nails does it take?

It uses 18-gauge brad nails up to 2 inches long. That covers most trim, casing and light assembly work.

Is it too heavy for overhead work?

At 7.6 lb it is heavier than a pneumatic brad nailer. For ceilings or long overhead runs, a lighter air or cordless model is easier on the arm.

Does it need a compressor?

No. It is fully cordless and runs only on Craftsman 20V batteries, so there is no air line or compressor.

Can it replace a pneumatic nailer?

For trim, baseboard and cabinet work, yes. For high-volume production or very tight spaces, a pneumatic gun's lighter body and smaller nose still have an edge.