What tool and nails would you recommend for fixing 50mm timber to a concrete wall?

Hi, Assuming it's going to be a dry internal application and the wall is poured concrete and not blockwork then I'd suggest looking at the X-U72 -P8/ MX nail ( data attached ) to ensure it meets your loading requirements with either of the DX6, DX5 or DX460 tools with the appropriate fastener guide.