There could be dozens of unseen gaps in any of the frames that you'd never know about without magnafluxing every gun. Their response will most likely be that it's fine ... if it ever causes a problem .... we'll fix it for you.
Doubtful, if the slide was cast properly there would be zero gaps / voids.
First ... the SLIDE is the thing that fits on top and SLIDES back and forth VD ... the FRAME is what we're talking about here ....
Evidently Ruger IS
saying that the frame was cast properly. Perfectly ? Maybe not. But properly ?? Sure ... It'll be fine.
If you want a PERFECTLY forged and machined frame ... buy a COLT ... or one of the others below that generally cost more and have a FORGED frame.
Some 1911 makers and their frame designs below .... clearly what most people consider the 'best' 1911's have FORGED frames ... this prevents any 'air bubbles' from being present in the frames.
Is a FORGED frame absolutely necessary to make a good 1911 ?? Probably NOT. Is a FORGED frame absolutely necessary to make a GREAT and ultra-durable
1911 ... probably so. Note that almost ALL the cheaper import guns which some people here so vehemently decry ... have the EXACT same frame type as Ruger, and that the 'Made in Brazil' Springfield Armory 1911's actually have a FORGED frame. Most 'top-line' 1911 builders will ONLY use a forged frame as a base for their custom 1911's. Anybody care to guess why ?
Colt - Forged
Springfield - Forged
Kimber - Forged
Rock Island - Cast
Charles Daly - Cast
S&W - Forged
Auto Ordnance - Cast
Para Ordnance - Cast
Essex (frames) - Cast
Wilson - Forged
Les Baer - Forged
Brolin - Cast
Ruger - Cast