I just found a casting flaw on the underside of my tisas hammer 1911 today while detail stripping it. It has alot of material left but clearly some is missing, its not chipped but just dented in appearance. I put another few mags through the gun today and no problems. Im changing out the hammer anyway with a S&W commander hammer so its really no big deal. This did get me thinking about what parts are considered high stress and prone to breakage. Im just (finally) starting my 1911 collection so learning all I can so any info will help.