The MCX from Sig Sauer is a high quality, double action air rifle that fires .177 air gun pellets.
They are made by the same people who manufacture the real firearms, therefore they are very realistic, and very good quality.
The MCX takes a 30 shot magazine that can be fired off as quickly as you can pull the trigger, and with the rifled barrel the accuracy is superb. The pellets are propelled by Co2 gas which is provided through an 88g cylinder for a massive shot count.
A multitude of weaver rails are also installed to allow you to mount scopes, lasers, and torches to your hearts content.