10mm Auto....there is NO substitute.
hint:......If you want 10mm Auto performance out of your Glock 21 just get a KKM or Barsto barrel and shoot .45 Super.
It will duplicate energy levels of 10mm Auto.
hint:......If you want 10mm Auto performance out of your Glock 21 just get a KKM or Barsto barrel and shoot .45 Super.
It will duplicate energy levels of 10mm Auto.





















































