Nah bugger all. Without getting the calipers out to check the actual measurements. The rear of the mag that holds the round in was 10mm which hadn't changed on the used mags. It was only towards the front, the new mag was 11.60ish and the old mags varied out to 12.10mm, so just a gentle tap with a soft head hammer to get them closer to spec.
A bit of a whack then measure, repeat till better or broken.
To be perfectly honest, I haven't had any issues aside from the springs getting tired. It was mainly because I'm doing a full maintenance check on the gun before France, otherwise I wouldn't have bothered.
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