quick question on syringes & pins

[ufc1313]

If I order syringes with needles already on them, can I use
it to draw the gear, then take the needle off and replace it with
a new one for injecting? Or do I need to order the syringes and pins

[ufc1313]

What I meant was do I need to order the syringes and needles separately?

[Billy Boy]

You will need twice the number of pins if you are to swop after piercing a vial so if you order 20 syringes get 40 pins if you don't use them all you can keep them for next time