Lonex flash mag help

[Jack Reacher]

Hi all how to I get this flash mag to fit my type 56 ie what part do I file down.cheers Jack

 

[two_zero]

which part doesn't fit?

 

[Jack Reacher]

The plastic bit at the back is just catching ,so I presume that bit ,but it's not very thick .cheers jack

 

[two_zero]

compared it with a mag that fits?

 

[ikarma70]

I had to remove a little from the end of the catch, doesn't need much to get it to lock in.