Tokyo Marui Mk23 Magazine - Leaking

For anyone thinking of buying this and the sellers information - this is not an easy fix if it is a genuine TM mark 23 magazine. They have a built in pressure release valve that will have failed by using the wrong gas ! -they don’t come apart like normal gas mags, you need to drill a pin out and then seal up the release valve - NOT AN EASY FIX - perhaps seller could amend the listing