the way your barrel cracked I'm guessing there was binding between the slide and barrel resulting in excessive impact of the barrel lug against the frame. is the frame at all damaged up in front of the feed ramp? would take a good look around there and the slide stop. there may be damage elsewhere too.
as i've posted in other threads, i've had many crap experiences with Ruger firearms over the past 5-6 years. i'm not at all surprised that your 10mm 1911 had such odd failures as a rear sight and the barrel lug. one would think that i'd avoid ruger firearms but their customer service is so excellent that i honestly don't care when their guns break. they will repair it once or so, then if it goes down again they issue a replacement which have all been perfect. i swear they get one of their smiths to hand pick a winner and work it over real nice. Colt did the same thing for me. it's a shame but the squeeky wheel gets the grease.
for example, i had a mini 14 that after 6k rounds was never 100% reliable. despite my tuning the gas system and replacing extractors, so forth, it woudl stovepipe like every 50 or so rounds. never fully resolved. so i finally sent it to ruger and they replaced this blued finish mini14 with a brand new stainless flash hider model. amazing service right there!
same for my ruger redhawk, two GP100's, SR9, some others i cannot recall. with Ruger's QC standards, their customer service people have great job security!!