Itself it weights around 400g (0,4kg / 0,9lb) Stock itself can be mounted on any kind of rifle where you are able to connect standard M4 stock (also using adapters, for example for AK/G36 etc). Micro HRR Regulator that's included with the stock has an output pressure range of 40-250psi which is easily adjusted using 2mm allen key. 3 output possibilities will allow you to use with with almost every HPA conv kit at the market!