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Posted: 1/3/2012 2:11:33 PM EDT
hey guys, i'm about ready to order one of the new CMMG mk-3 rifles from CDNN when they get some more fde finished ones in stock. well CMMG finally has these rifles on there website and it says they are using billet 6061 T6 for the upper/lower. should this be a cause for concern compared to the 7075 that the high end brands are using to make their guns? thanks for the input guys!
Link Posted: 1/3/2012 8:08:04 PM EDT
Tactical Machining used to use 6061 rather than the 7075 they use now and I have had no issues with the lowers I have from them
Link Posted: 1/3/2012 8:43:18 PM EDT
Originally Posted By RuLins05:
Tactical Machining used to use 6061 rather than the 7075 they use now and I have had no issues with the lowers I have from them


thanks for the input!
Link Posted: 1/3/2012 9:13:48 PM EDT
The 7000 T6 series Aluminum is stronger (more tensile strength) vs. the 6000 T6 series overall.
That is why most quality manufacturers have switched to 7000 series Aluminum...
Although, 6000 series Aluminum is just fine and will not make a huge differance.
Link Posted: 1/5/2012 7:42:34 AM EDT
[Last Edit: 1/5/2012 7:44:41 AM EDT by shepheard]
Interesting that this thread was posted as I just had a technical discussion about this with Bushmaster concerning their MOE 308 mid length. I was told that the upper and lower are both 7075.

I don't think the CMMG will fail any faster with 6061 but it does seem like the industry standard for higher end rifles is 7075.
Link Posted: 1/5/2012 6:55:54 PM EDT
IIRC the ar15 (pre m16) was originally 6061 and they ran into corrosion problems in SE asia, and that is why it was changed to 7075 series Aluminum alloy.....not a strength issue.

advntrjnky
Link Posted: 1/5/2012 7:48:35 PM EDT
Originally Posted By advntrjnky:
IIRC the ar15 (pre m16) was originally 6061 and they ran into corrosion problems in SE asia, and that is why it was changed to 7075 series Aluminum alloy.....not a strength issue.

advntrjnky



You would be correct, 7000 series T6 Aluminum does also have better corrosion resistance (salt water test) than 6000 series T6 Aluminum.
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