Hi, Im new to glock and really new to 10mm,  Was going to get a G35 but while at the LGS was shown a G40, The reason I was going with the 35 was because I shoot a 40 at this time and reload, how ever I spend a lot of time in the Mtns and was thinking the 10mm might fit the bill a little better. Have shot 44mag for yrs so recoil isn't a problem. My question is with the 10mm can I do a 40, and a 9mm conversion  if I swap barrels and mags,  Thanks for any and all help