Quoted:
A "Service M14" will cost you about 20-25 grand, a M1A won't. I believe the GI forged receivers are good for 450K rounds, the M1A for around 250K 450k rounds. Thats a lot of barrels to burn out.
Fixed
Per Larry Collenson who is production manager at SAI, their M1A receiver will withstand 450k rounds, the same as a USGI receiver due to the heat treatment used.
Quoted:
Through holes, threaded areas, rails and slots will wear at a faster rate on a cast receiver Through holes, threaded areas, rails and slots will wear at the same rate on a cast receiver, but like another poster stated, 250,000 rounds is one helluva a lot or rebarrelling jobs and more than most M1A owners will put through their rifle in a lifetime of shooting.
Fixed
The only real differences between forged & cast is the process in making the blank piece that is then final machined.
Machining cost will effect the final price & each company has their own way of doing that.
All other things are equal if the heat treat is done correctly on both methods.
All forged & cast receivers need some level of fitting, some more than others as I've never seen a receiver that was good as is.
The only receiver failure I've ever seen was an Armscorp & the true reason was never known.
Warbird