This is the hand guard I put on my PSA 16". Its a UTG PRO M-LOK® AR15 13" Super Slim Free Float Hand guard. I put rubber plugs in the unused m-lok slots and wrapped it in grip tape.
No, it's an ex-Bundeswehr anti-aircraft tripod for the MG3. I put a picatinny adapter on it, so I can use it with any gun with a picatinny rail.