What you need to do is load up your mag with the longest shells your gun will shoot then measure the total length of everything over 2 cut your piece of plastic coat hanger (I prefer this over wood as it will not hold moisture). Different models and makes have different mag capacities (I have had them in either 4 or 5). insert it into the centre of the spring and you are good to go.
"BORN TO HUNT"
Foxton's Cuervo Gold "KEELA" Oct. 2004-June 2017. Always in my blind and my heart.
I called over 20 post office stores and they were out. The only one left with them was the Shoppers Drug Mart on 200th street and about 40th in Langley. (604) 530-5388