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Posted: 12/2/2006 4:41:24 PM EDT
| were can I buy 80% lowers from |
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Look at these links: Jig and tooling This is Keven mentioned in the above link. Forgings and castings There is a lot to beware of, for example the drawing available on this site has no notes, so you don't realize the hole diameters are about .002 oversize to accommodate the anodizing. Plus you really can't do the proper anodizing at home. Which leads one to this CMX - Ceramic Metal Matrix where you make the holes fit your LPK and finish with TEFLON/MOLY OVEN CURE, GUN FINISH or whatever. You can get most all the drill bits at a good hardware store. Good luck. LPK = Lower Part Kit |
The blueprint on Justin's site is a cleaned up copy of the Colt blueprint dated 2-14-93 and is only the 1st page of 12 that were redrawn by D. Snider in 2000. The hole sizes on the prints are correct and already take into account the anodizing thickness. As you said, Snider didn't add the machinist notes that are on the original prints, but note #1 on the Colt and USArmy Ordnance Prints states "All dimensions apply before finish". No adjustment in dimensions is required. And yes, you can do proper anodizing at home... Tanneryshop Cast A356-T6 Lower  KTOrdnance Billet Lowers  30rd AR Mag 
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I'm also getting ready to do a few lowers... I've looked around on the net but it seems Tannery Shop's site is all kinds of screwed up. Are his castings available, and how much are they. I'm debating between the CMX one and the Tannery shop casting (since its half the price) Are the kits on vbd.com with the jiggs and bits worth it, or should I buy my own bits and a jigg from CNC. I know the CNC looks nicer but will there be any issues if I use a CMX 80% rather than a KT Ordy one with it? |
Looks like William has redesigned his website (tanneryshop.com). It worked fine for me, but his Cast Lowers are $86.95 for Grade 1 & $76.95 for Grade 2. I assume he has them in stock since other items are marked as being Out of Stock. I don't know if the CMX lower fits any of the jigs. Tanneryshop use to carry them, but they are no longer listed. I'd suggest you give Tannery a call, he may be able to provide some help on that. He also has a jig with all drills/reamers available for rent ($250 deposit) and has a warranty on the lowers where if you screw it up and return it to him, he'll give you a $40 credit toward the purchase of another one. The rental and the warranty may make it a cheaper investment before you dump a larger amount of money and go into one of the more expensive (but nice) KT lowers. |
It's been discussed some here: Type III Hard Coat Anodizing The drawing I was referring to is on this site, as in the one you are looking at right now. And other than the lack of notes the other thing I don't like is casting and machining drawings mixed together. But it works and is the right price so... One other thing, it is possible to make a multi page Adobe PDF file that would have all the sheets. |
I missed the your reference to the print posted on ARFCom, but after looking at it, it is exactly the same version as the one posted on CNC's site (although the one on ARF is better quality), so there is no need to adjust measurements no matter which site you use. I think the CAD drawings add character and they are a vast improvement over what was available previously.
I'm sure it is possible, but mine are hardcopy 11x17" and would be difficult to fit on my 8x11" scanner. |
| If you put the drawing on a CD (as a PDF file) and take it to Kinko's they can print it as a full scale D size drawing. When they ask just say "full scale". I've checked some of the features with a caliper and it's real close. 8.5 x 11 is A size and 11x17 is B size. |
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