As far as ive seen, the best mags for alleviation of that problem are the TAPCO's they come with nowadays.
As for steel mags, Ive heard mixed reviews. Since Century doesnt mill the recievers to the exact tolerances every time, some mags will fit different in different guns.
For a solution to the problem, Ive seen alot of temporary redneck fixes, but nothing permanent. You might want to take it to a gunsmith and see what they suggest.
Hope this helps,
Kenny