says the shop is run by DCI Ltd.
Companies House says DCI Ltd is a Scottish company which has nothing to do with firearms.
However the link to the shop goes to http://emrr.org.uk/
and Nominet say that is owned by :
1 Butler Close
Nominet was able to match the registrant's name and address against a 3rd party data source on 10-Dec-2012
1 & 1 Internet SE [Tag = 1AND1]
Registered on: 12-Apr-2011
Expiry date: 12-Apr-2017
Last updated: 07-Jan-2016
Registered until expiry date.
WHOIS lookup made at 17:58:24 03-Mar-2016
So it seems they have existed for 5 years - no guarantee they still do.
Hope that helps - and for anyone wondering it is public info ( http://www.nominet.org.uk/whois/
) so no DPA stuff applies.
Edit - eastmidlandsregionalrange.org.uk is owned by the same gentleman.