This is my knex tactical crossbow =D It has an M4 based setup and bow arms from project A V2. It has reached ranges of almost 85 ft =D So far it has never failed or had a problem after shooting it for 1 month. Also it has a folding bipod that is slightly useful and a storage slot for ammo or knex throwing knives. At some point I will be updating this and possibly adding a hopper. Sorry about the bad pics, I didn't have my good camera at the time.