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Old 05-15-2013, 10:29 PM   #31
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Just found out it is 4140 steel how bad is that cause I've never heaard of that being used in a bcg
I haven't heard of 4140 steel in a bolt or carrier. I especially wouldn't want it for the bolt! DPMS should be called out about this if it's true.
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Old 05-15-2013, 10:33 PM   #32
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Are you sure DPMS said the bolt is 4140? I bet they meant the barrel.
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Old 05-15-2013, 11:39 PM   #33
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Or perhaps the carrier is 4140 and the bolt could be something else?
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Old 05-16-2013, 12:44 AM   #34
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Well DPMS never has been good at listing specs. On the other hand look at how BCM describes their BCG!

•Milspec Carpenter No. 158 steel bolt
•HPT Bolt (High Pressure Tested/ Proof)
•MPI Bolt (Magnetic Particle Inspected)
•Shot Peened Bolt
•Chrome Lined Carrier (AUTO)
•Chrome Lined Gas Key
•Gas Key Hardened to USGI Specifications
•Grade 8 Hardened Fasteners
•Key Staked Per Mil-Spec
•Tool Steel Extractor
•BCM Extractor Spring
•Black Extractor Insert
•Mil-Spec Crane O-Ring
http://www.bravocompanyusa.com/BCM-Bolt-Carrier-Group-MPI-Auto-M16-p/bcm%20bolt%20carrier%20group%20auto%20mp.htm
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Old 05-16-2013, 01:08 AM   #35
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Are you sure DPMS said the bolt is 4140? I bet they meant the barrel.
They emailed me that the BCG is 4140 kinda beside myself maybe the ment the carrier but that doesn't make sense either
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Old 05-16-2013, 01:17 AM   #36
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This is the email i got from them so u tell me?????? sorry for the zoom lvl but u can read it
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