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Thread: Aim Surplus AR Foundation Kit
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13 July 2015, 18:34 #31
Hard coat anodizing, which is basically what all parts are done with in the firearms industry, is much thicker. A good anodizer lets you specify the thickness, which is normally one or two thousandths of an inch (not ten-thousandths), with half being buildup on the outside of the part, and half going into the aluminum. This is very important because the tolerances on each part can change significantly. The fact that it builds up into the aluminum is also why it's so durable.
Anything you see that isn't black, elephant gray (6061 with no dye), or light bronze (7075 with no dye), is probably not hard coat, and will not be very durable. All those little magazine releases in rainbow colors are not hard coat anodized, for instance.Last edited by Slippers; 14 July 2015 at 05:09.
Will - Owner of Arisaka LLC - http://www.arisakadefense.com
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13 July 2015, 19:30 #32
I don't know if they're Toolcraft or not but Cryptic Coatings also uses Toolcraft. I agree that the price will make you have doubts about what you're getting, but I can say that I've had nothing but great service and products from Aim Surplus. Not saying whether or not this is a good BCG, but I do think it's a good deal. Here is the description on the BCG from them:
AIM AR/M16 .223/5.56 complete Bolt Carrier Groups. We are having these bolts manufactured to our exacting standards with no Frills added to be able to offer the best BCG at the Best Price! Features 9310 Bolt Material; 8620 Chrome lined carrier and gas key; Properly staked Investment cast gas key hardened to USGI specifications fastened with Hardened Grade 8 Fasteners; Shot peened MPI (Magnetic Particle Inspected) Bolt. Extractor includes Black Insert.
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13 July 2015, 22:35 #33
Anodizing doesn't 'go into the aluminum'. The electrolytic process of anodizing realigns the surface molecules (which also causes the color change to black from the chemical reaction of the acid with the aluminum). It is the alignment of the surface molecules of the metal that hardens it and makes it stronger. The longer you leave a part in an anodizing tank, the deeper the surface will be anodized. Keep in mind, whether it's 1 thousandth of an inch or 2 or even one 10 thousandth, it is only that depth of the surface molecules being realigned.Freedom is NEVER Free. We have to work to protect it and even be willing to die to protect it.
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14 July 2015, 04:04 #34
Getting way off topic but oh well.
You get a build up of the oxide on the outside as well as penetration into the part. Hence the phrasing - going into the aluminum.
With regards to MIL-A-8625 Type III Class 2 hard coat anodizing, which is what we're talking about for AR15 parts, you get some color change without dye (which would be Class 1), but it's only going to look black like we expect it to if dye is applied after the part comes out of the acid bath, since it is very porous before it's sealed.
Fun fact - leave a black anodized part outside in the sun for a year or so and it turns brown as the dye breaks down.Last edited by Slippers; 14 July 2015 at 04:52. Reason: Clarifying
Will - Owner of Arisaka LLC - http://www.arisakadefense.com
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15 July 2015, 11:53 #35
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15 July 2015, 13:45 #36WEVO Spell Checker
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We need to trow this in to the T&E program
Never mind sold outLast edited by toolboxluis00200; 15 July 2015 at 13:53.
$300 and 10 Pastrami Sandwiches and a case of Diet Coke. ( UWone77)
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15 July 2015, 16:52 #37
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15 July 2015, 16:53 #38
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15 July 2015, 17:14 #39WEVO Spell Checker
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15 July 2015, 17:18 #40
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15 July 2015, 17:23 #41
Aim Surplus AR Foundation Kit
Awesome.
Sent from my iPhone using TapatalkFacebook - Marty Callan
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15 July 2015, 17:36 #42
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15 July 2015, 18:09 #43
I didn't copy and paste it UWone, I wrote it from scratch. I thought I had already posted about this before too. Yep, it's getting off topic. Didn't mean to hijack the thread. Slippers is correct that if you leave a black anodized part out in the sun, the color will change. Most anodizing facilities add the dye to the acid bath and most machining facilities parts get sent out for anodizing - it isn't done in house. Extrusion factories often have their own anodizing tanks capable of handling large volumes of 6-8 ft. long extruded profiles. They also do smaller parts. I know several of them. Small part anodizing isn't all that expensive to set up though so I'm sure some companies do their own anodizing.
The AIM Surplus deal is a good deal whichever way you look at it.Freedom is NEVER Free. We have to work to protect it and even be willing to die to protect it.
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15 July 2015, 18:33 #44
I'll just leave this here...
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15 July 2015, 19:01 #45WEVO Spell Checker
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