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I checked the archives and found the McMaster Carr part numbers for the replacement recoil springs (9637K65) and buffer material (8789K32). Checking with McMaster Carr, they need to know what Durometer is needed for the Buffer material. 40A - Medium Soft, 60A - Medium Hare, 80A - Hard, 90A - Extra Hard, 95A - Extra Hard, or 75A - Extra Hard. Any help will be appreciated.

 

Machinegun Charlie

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harder is what you need start with 95a

the soft ones are really soft and will be chewed up within a hundred rounds ..................seriously .

been there done that

 

Found the OEM springs with a longer charging handle to run the best

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