According to "The MAC Man: Gordon B. Ingram and His SubMachine Guns"
"The 9mm MPA30 ....unlike earlier MAC, RPB and SWD models uses inexpensive Sten magazines and the composite plastic ones being offered by TAPCO."
Also, "The Texas/SWD 9mm guns used the same SWD Zytel magazines as the M11/Nine."
If you have the Zytel mags, then the Masterpiece Ams guns are out, M10 9mm are out, Texas and M11/Nines are okay. Sorry, I wasn't more help. You may also get better answers on the discussion board at the link listed above. You don't have to register, just ask away. Good luck.