A Riser for your Airsoft Replica is designed to raise your scope or sight so you can see through it better when wearing a mask.
A mask often ensures that if you want to look through your scope or sight, your mask comes against your stock and therefore you can not see through your scope of sight comfortably. The solution is to place the scope or sight a little higher so you have less trouble with it.
Also, a riser is useful if you place a magnifier in front of your scope of sight and it is just not nicely aligned.
