I have a CAA-MIC Roni 4 with magpul back up sights,DQ swivels. This fits G19 gen 4 and G17 gen 4. This is the updated model. The front mag holder is removable. It has an arm brace that folds to the side. I paid over 245 for chasis, 70 for the sights and 30 for the QD swivels. I'd like to get 220$ for it. Thank you Guys and God bless.