Never saw a feed throat break in over 40 years, tho I've seen a pile that were worn out. Many times the bolt buffer breaks apart--the plastic thing at the end of the trigger group. That having been said, the only feed throats available are the new type. When you have an older type, you buy the kit which includes a new type lifter and lifter spring/ejector. Don't know where the changeover occurred, but on some I've had to change the bolt body which is modified to match the new throat. Best of luck to you. Not a hard job, but a pain to disassemble the trigger group to put in the new throat. Goatwhiskers
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