Ok My buddy brought over this pistol becuase it was "broken" he said it happened while shooting it. ( somehow the recoil spring guide got flipped over 180 degrees). I visually inspected every thing and It all looks OK the pistol functions fine I test shoot it with subsonic ammo and it shoots great. Then after talking with him i found out he was shooting high velocity ammo through it I have always been told that was a NO NO with old autos he told me he had shot a lot of this through his pistol. My questions are What areas shuld i inspect more closly for damage Breech and bolt face looked normal and my second question Brownells sells a higher rated recoil spring 6.6 LBS instead of factory 5 lbs (their Numbers) will this allow the pistol to shoot the more modern ammo safely? Thanks in advance