The Swiss Arms Sig Sauer GSR 1911 is a mostly plastic 4.5mm CO2 BB shooter but does come with a laser sight, a pair of protective glasses and some BB's to get you started so all in all the Sig Sauer GSR 1911 does make for a pretty good low price starter gun! There is not too much going on, you have your basic double action trigger with no real other moving parts except for a safety switch.