Dungeon, It still will probably not work, mine only has about 3/8 of a needle, the 2nd problem is, it is too small of a point, the syringe needs a fat point to make a seal in the opening of the mold, you cannot have a air gap at the sprue or it will not fill the tail, it needs to be able to push the air out of the chamber as it fills it.
when you inject it, it will fill the chamber and you will feel that you are not able to squeeze anymore, then you need to release the pressure and then top fill the sprue after you pull the syringe out.