The 10mm has a longer OAL than the 9mm. Will the 10mm mag even fit in the magwell of a 9mm 1911?
Some .40S&W ( a shorter 10mm) mags will seat and function with 9mm but I've not heard the same for 10mm.
Seeing as you already have the mags, why not try one in your 9mm 1911 and see how it feeds?



























