The 2240 was too loud. It isn't now. 3D printed ABS. Added sections are bonded to the main body. Friction fit. It slides on/off to change out C02. Has front sight incorporated. The main body with sight incorporates a large volume and smaller sections are added. I've added 3 sections. (2 shown in one image, 4 in the other.) 3 was the best average of quiet and length and is shown on the 2240.