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Posted: 2/28/2006 1:47:50 PM EDT
Are Colt upper and lower receivers manufactured from 7075-T6 aluminum or 6061-T6? If so, what year did that occur?

Muzzleflash 11
Link Posted: 3/14/2006 1:18:34 PM EDT
I don't know!
Link Posted: 3/14/2006 1:21:24 PM EDT
Link Posted: 3/14/2006 1:51:30 PM EDT
They were supposed to have been made out of 7075 but Colt went cheap for awhile. Due to corrosion problems in Vietnam they had switch to 7075. Think that happened in 1968.
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