this might be a stupid question but i'll ask it anyway. what's 140mm & 170mm mags replacement springs? pag-sinabi bang 140mm it's for officer size mags & the 170mm is for the gov't & commander size mags? or pag 140mm spring is for 7-rndr mags & 170mm is for 8-rndr mags? help...please... wala kasi akong alam tungkol dito.