Does blocking traffic from a country via a firewall affect my ranking?

[Bear.Group]

The main conversion point on my site is a contact form completion. Approximately a third of my conversions last year were from an international country we don't sell our services in, and all those conversions were attempts to sell us services. We are considering blocking the traffic to the site from that country. I'm trying to figure out if that will negatively affect my SEO rank here in the US before we proceed with that plan.

Does anyone have any experience with implementing this tactic?

[Mobilio]

I think that answers here can help you:
https://moz.com/community/q/blocking-certain-countries-via-ip-address-location

Since question is similar. Adding PHP code for geolocation checks (maxmind geoip) is just 2-3 lines of code. And you can ignore submissions from other countries.

[Bear.Group]

Thank you, Peter. This is exactly what I was looking for.