"Forged vs cast M-14s/M1As" has become one of THE gun debates ala "AR vs AK", "9mm vs 45ACP" etc, etc - ad nauseum.

As with everything else - the key here is realistic assessment. Each prospective buyer has to realisticly assess their needs, capabilities and budget. The next step is to gather ACCURATE information from as many sources as possible before purchasing.
I've owned an M1A for 18 years, carried an M-14 type rifle in the field as often as possible for 20 years, been trained by the Army as an armorer and built over two dozen M-14s from parts as a 'smith. You COULD say I have a little experience...

If SA's cast receivers were failing as much as some detractors claim, they would have to either RADICALLY improve QC or go out of business. They're STILL in business and the M1A family is one of the most popular among firearms owners. Of course there are problem rifles but, SA stands behind their product - I actually know of only ONE person who had to send a rifle back and he was well-treated and had his rifle back quickly.
If Clint McKee is so down on cast receivers, why does he use CAST receivers made by Armscorp for EVERY Fulton built rifle?
LRB make A LOT of claims - I haven't handled their product, so I can't really comment from experience. Altho' I believe that's who was alluded to above regarding the difference between machining vs ACTUAL forging.
I've handled and shot both Norincos and Polytechs - some original and some re-heattreated and fitted with GI parts. They're fine rifles for the money. If it were me, I'd rather be able to use GI parts.
Much as I'd love to have a GI M-14 of my own, that's not possible - so I went with the next best option.
My Fulton built rifle - Armscorp receiver, Kreiger bbl and GI parts - has over 12,000 rounds through it without a hiccup.
The M-25 I built - Armscorp receiver, GI NM bbl and GI parts - has close to 9,000 rounds through it and no issues.
The latest is an SA SOCOM - 2,500 rounds fired so far and no problems.
Considering that the original GI receivers are conservatively rated for 50,000 rounds, I imagine my rifles - cast receivers all - will hold up for a good LONG while!
Chief D