Joined: July 16 2005 Location: United States Posts: 25019
Posted: May 22 2010 at 9:58pm | IP Logged
thanks!
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gundoctor
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Posted: May 22 2010 at 10:12pm | IP Logged
Very nice drawings. Thanks for your contribution.
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joezx10r
Sgt
Joined: August 11 2009 Location: United States Posts: 59
Posted: May 23 2010 at 1:47pm | IP Logged
Added the carrier. I cant get it to post strait. No matter what I do its all jumbled up for some reason.
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gundoctor
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Posted: May 23 2010 at 2:06pm | IP Logged
fixed it for you
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joezx10r
Sgt
Joined: August 11 2009 Location: United States Posts: 59
Posted: May 23 2010 at 2:15pm | IP Logged
Awesome thanks
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midmichigun
CPT
Joined: March 01 2008 Location: United States Posts: 1929
Posted: May 23 2010 at 11:44pm | IP Logged
Yo Joe,
Thanks a bunch! I have been carving up metal to "make" carriers.. for AR's... so its good to see something concrete.
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weaponeer
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Posted: May 29 2010 at 10:14pm | IP Logged
the more prints we have the better
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Mark W
Cpl
Joined: September 13 2010 Location: Switzerland Posts: 35
Posted: November 03 2010 at 10:51am | IP Logged
Excellent work mate! I wish I could work this 3D programs as you, the most I've done was a cube
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Hestheone
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Posted: October 27 2011 at 11:57am | IP Logged
Thank you for this. I was about to measure and draw when I came across this. It is very useful and helpful. I appreciate your contribution.
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mace2364
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Posted: May 15 2012 at 12:50pm | IP Logged
What are the specs for hardness of these parts?
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wjohn13
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Posted: January 01 2013 at 9:39pm | IP Logged
The drawings look really nice. the only thing I see that is needed are tolerances. Any help with those, would be greatly appreciated. Thanks.
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kb0331
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Posted: January 08 2013 at 9:17pm | IP Logged
Has anyone had any experience machining one of these? Any words of wisdom before I start cutting into one.
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machinist360
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Posted: January 09 2013 at 10:39pm | IP Logged
I know this is an old post but Thanks!!
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Pelagicdude
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Posted: February 15 2013 at 4:39pm | IP Logged
wjohn13 wrote:
The drawings look really nice. the only thing I see that is needed are tolerances. Any help with those, would be greatly appreciated. Thanks.
Bolts: standard mil spec 8620 (used to be called carpenter 15, SAE9310 for performance
Carriers: I believe this is just common steel/stainless. Many use 416 stainless. The pressure is really on the bolt and not so much the carrier. Alot of 3gunners like lightened/ drilled out carriers.
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foxbat
E-2
Joined: February 14 2013 Location: United States Posts: 19
Posted: February 16 2013 at 6:03pm | IP Logged
The bolt is case-hardened to a depth of .010-.015 and a surface hardness of 45 Rockwell (I think). The back ends of the locking lugs get ground after hardening to ensure they all touch the corresponding lugs on the barrel extension. I would not recommend lightening the carrier - the sub-rifle length gas systems (from what I have read) attempt to extract the case too early, which breaks a lot of bolts. There are several patents I am aware of that offer improvements to the bolt geometry and improves the performance in the shorter gas systems.
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northumbrian
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Posted: February 19 2013 at 2:33am | IP Logged
Very nice, thank you very much.
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ogkw87
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Posted: March 29 2013 at 6:33am | IP Logged
in the "bolt carrier face and cross section" file, can you include the ramp face dimenions that is on the front of the carrier, bottom? namely the width of the bcg bottom flat.
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x 4
x 3
x 1
No matter what I do its all jumbled up for some reason.
, SAE9310 for performance
