21° or 30° framing nailer? What is the difference? : Tools- dewalt cordless framing nailer 30 degree vs 21 degree framing nailer troubleshooting ,I am thinking about buying an air framing nailer. I see two different kinds advertised, 21 and 30 , can anyone tell me what the difference is and if there are any advantages to one or the other. I am probably going to get a lower priced brand, probably from harbor freight.What Size Nails for a Framing Nail Gun? | HGTV16/7/2019· Framing nail guns come in a wide variety of nailing angles and capacities. HGTV breaks down how to find the right nails for your framing nailer. 21-Degree Framing Nailers: These nailers are capable of driving a full round head nail and the low angle is great for working in tight spaces. 21-degree nails are held together in plastic clips that shatter as the nails are being driven.