Hi Prabhath,
Welcome to the forum.
The Steyr LP10 is great choice. I fill mine using a Hill Pumps or SCUBA dive cylinder.
http://www.airriflepump.com/ (Looks like an LP10 in the Hill Advert on their web page)
I find the Hill pump well made and when it does need a service you can buy all the spares for it.
Thanks
Mark