Yes, both end caps unscrew, center portion slides out. STO sent a 1/2x20 instead of ordered M14. They sent correct end cap, just had to switch out. Some caps unscrew easily, some not. Trick to removing end cap without damage was remove exit cap, slide innards out, screw what's left on gun moderator threads, then reach in to install nut, or thread protector. Turning moderator shell off will cause end cap to loosen. WM