I know that one of the key reliability factors of the Glock pistols is a lack of chamber support so the cartridge can feed very reliable , but I have read several times lately that Glock has beefed up their chamber support and there is better chamber support than it used to be . Is this true ? I checked my older G30 (from 1997) verses my G21 (from 2010) and the chambers look the same. I did the comparison by taking each barrel out and putting a cartridge in each and comparing the exposed part of the cartridge. Do any of you guys know for sure if Glock has beefed up the chambers ?