To all those magazine hacks out there. Just a comparison here showing the soldered witness holes on a 20 round Thompson stick mag (Maguire Era incorrect patent dated) and a 32 round Sten Gun mag (Stamped 1.C.R.1) Note an identical version of a 32 round Sten mag that hasn't been soldered. It's a fair assumption that both these soldered magazines were used in the North African WW2 campaign as the soldered witness holes were engineered in order to keep the sand out the mags which caused jams. Also note the difference in magazine length of the Lanchester 50 round mag,Sten Gun 32 Round mag,Thompson 30 round mag & the Thompson 20 round mag. Thanks for reading. JD.