AR15.Com Archives
 ar15-kits.com 80% lower/jig combination sets
mace2364  [Member]
8/1/2010 8:40:03 PM
Any of you ever use one of the 80% lower and jig combination sets from these guys? I saw them listed on gun-deals. They even have 7.62 80% lowers and jigs.

http://www.ar15-kits.com/index1.html

I was considering getting something like this, but I was hoping someone had some experience with them. They claim that they have had people finish them with a drill press and a dremel, though it's alot of work. That doesn't seem too far out of line from what I have seen here. If one were to finish one of these with a drill press, what kind of a bit would you use?

Thanks
crackedcornish  [Team Member]
8/1/2010 9:22:50 PM
go to Tactical Machining and check out their stuff before you buy anything
Russ4777  [Team Member]
8/2/2010 12:18:58 AM
Check out Colfax Tactical as well. Their lowers and drilling fixtures are excellent.

http://www.colfaxtactical.com/index.htm
phurba  [Life Member]
8/2/2010 12:53:04 AM
I have access to CNC mills but I'm not experienced in using them. Is there any place I can by or download the files to work a 0 or 80% or do I need experience before I try it?
eliteAR  [Member]
8/2/2010 7:47:24 AM
go to WWW.AR15JIGS.COM is the best guys to buy from.
shrikefan  [Team Member]
8/2/2010 8:51:46 AM
Originally Posted By Russ4777:
Check out Colfax Tactical as well. Their lowers and drilling fixtures are excellent.

http://www.colfaxtactical.com/index.htm


Any experience with them?

RDTCU  [Team Member]
8/2/2010 8:54:34 AM

Originally Posted By crackedcornish:
go to Tactical Machining and check out their stuff before you buy anything

Yep, I've finished a few of theirs and they are good stuff...
DCMoney  [Member]
8/2/2010 9:42:18 AM
Originally Posted By phurba:
I have access to CNC mills but I'm not experienced in using them. Is there any place I can by or download the files to work a 0 or 80% or do I need experience before I try it?


You need experience; I’ve done a bunch with the CNC and find myself going back to the manual mill to do the majority of the work for a lower receiver.
mace2364  [Member]
8/2/2010 12:50:52 PM
Well, having looked at some of these, and thought about it a bit, I think I'm going to stick with just assembling completed lowers. I don't think I've got the experience to do the required work. In addition, while I wasn't expecting this to be cheaper, I did not expect the 80% recievers to be more expensive than completed lowers, to the tune of $50 more in some cases anyway. But thanks for the advice. Maybe someday.
JustKeepSwimming  [Member]
8/2/2010 2:05:25 PM
Originally Posted By phurba:
I have access to CNC mills but I'm not experienced in using them. Is there any place I can by or download the files to work a 0 or 80% or do I need experience before I try it?


If you have "some" machining experience, download the Ray-Vin manual on machining your own from 0% and see if it looks like something you can handle. The manual is 14 or 15 PDF files and it's free. http://ray-vin.com/frtech.htm

0% forgings are $20-25, so if you have access to setup tooling and cutters too, it's not that expensive to give it a try. At worst you start out with a paperweight and end up with a lighter paperweight and on your second try you have a good idea what you need to do.

If you have 0 machining experience, that probably won't end up well for your 0% lower and it may not end up well for your eyes or fingers if your experience doesn't include basic machinist safety rules.
phurba  [Life Member]
8/2/2010 3:01:40 PM
Originally Posted By JustKeepSwimming:
Originally Posted By phurba:
I have access to CNC mills but I'm not experienced in using them. Is there any place I can by or download the files to work a 0 or 80% or do I need experience before I try it?


If you have "some" machining experience, download the Ray-Vin manual on machining your own from 0% and see if it looks like something you can handle. The manual is 14 or 15 PDF files and it's free. http://ray-vin.com/frtech.htm

0% forgings are $20-25, so if you have access to setup tooling and cutters too, it's not that expensive to give it a try. At worst you start out with a paperweight and end up with a lighter paperweight and on your second try you have a good idea what you need to do.

If you have 0 machining experience, that probably won't end up well for your 0% lower and it may not end up well for your eyes or fingers if your experience doesn't include basic machinist safety rules.


Thanks for the link. I'll check that out tonight.
Russ4777  [Team Member]
8/2/2010 6:59:46 PM
Originally Posted By shrikefan:
Originally Posted By Russ4777:
Check out Colfax Tactical as well. Their lowers and drilling fixtures are excellent.

http://www.colfaxtactical.com/index.htm


Any experience with them?



Yep. I have finished one of their receivers. All the really difficult stuff is done. All that's left is machining out the FCG pocket and drilling the hammer, trigger, and selector holes.
bradbn4  [Team Member]
8/2/2010 7:14:21 PM
It seems that Spike's will sell 80% lowers 5 for 100 dollars.

I wonder if the above jigs will work.
80% Spikes Lower

If you want to buy just one use this Link

Brad
phurba  [Life Member]
8/2/2010 7:15:46 PM
I found bigger hammer's autocad files. I'm going to do some work with those this week or next and see if I can make a block of foam look like an AR receiver
DiscipleGreg  [Member]
8/2/2010 7:48:34 PM
Originally Posted By bradbn4:
It seems that Spike's will sell 80% lowers 5 for 100 dollars.

Those are 0% lowers, NOT 80% lowers. Big difference.
bradbn4  [Team Member]
8/2/2010 10:44:42 PM
Originally Posted By DiscipleGreg:
Originally Posted By bradbn4:
It seems that Spike's will sell 80% lowers 5 for 100 dollars.

Those are 0% lowers, NOT 80% lowers. Big difference.


I will take your word for it - but the picture looks to be an 80% lower.

I will ask Spike's if it is a 80% or a zero percent.

Brad

Added: looking at the top of the receiver - it does look like a ruff 0% -


Other than for pure fun - why would someone pay, well - so much more for a 80% receiver vs a finished receiver?

phurba  [Life Member]
8/3/2010 1:35:40 AM
Originally Posted By bradbn4:
Originally Posted By DiscipleGreg:
Originally Posted By bradbn4:
It seems that Spike's will sell 80% lowers 5 for 100 dollars.

Those are 0% lowers, NOT 80% lowers. Big difference.


I will take your word for it - but the picture looks to be an 80% lower.

I will ask Spike's if it is a 80% or a zero percent.

Brad

Added: looking at the top of the receiver - it does look like a ruff 0% -


Other than for pure fun - why would someone pay, well - so much more for a 80% receiver vs a finished receiver?



Because it's a fun challenge, for one. Not requiring an FFL transfer. In some states (CA that I know of) the only way to legally get a semiauto AR pistol is to start with a 0 or 80% forging. Something about converting a rifle to a pistol, I dunno.

Once you can machine somebody else's forging, you can take a stab at casting them yourself. Nothing like making a gun out of recycled aluminum
thebrassnuckles  [Team Member]
8/3/2010 2:23:52 PM
Originally Posted By phurba:
Originally Posted By bradbn4:
Originally Posted By DiscipleGreg:
Originally Posted By bradbn4:
It seems that Spike's will sell 80% lowers 5 for 100 dollars.

Those are 0% lowers, NOT 80% lowers. Big difference.


I will take your word for it - but the picture looks to be an 80% lower.

I will ask Spike's if it is a 80% or a zero percent.

Brad

Added: looking at the top of the receiver - it does look like a ruff 0% -


Other than for pure fun - why would someone pay, well - so much more for a 80% receiver vs a finished receiver?



Because it's a fun challenge, for one. Not requiring an FFL transfer. In some states (CA that I know of) the only way to legally get a semiauto AR pistol is to start with a 0 or 80% forging. Something about converting a rifle to a pistol, I dunno.

Once you can machine somebody else's forging, you can take a stab at casting them yourself. Nothing like making a gun out of recycled aluminum


erronious. you can buy a sig p556 from several vendors and the y are more than happy to make the needed mods.
but it is one way to do it.
phurba  [Life Member]
8/3/2010 3:02:20 PM
Originally Posted By thebrassnuckles:
Originally Posted By phurba:
Originally Posted By bradbn4:
Originally Posted By DiscipleGreg:
Originally Posted By bradbn4:
It seems that Spike's will sell 80% lowers 5 for 100 dollars.

Those are 0% lowers, NOT 80% lowers. Big difference.


I will take your word for it - but the picture looks to be an 80% lower.

I will ask Spike's if it is a 80% or a zero percent.

Brad

Added: looking at the top of the receiver - it does look like a ruff 0% -


Other than for pure fun - why would someone pay, well - so much more for a 80% receiver vs a finished receiver?



Because it's a fun challenge, for one. Not requiring an FFL transfer. In some states (CA that I know of) the only way to legally get a semiauto AR pistol is to start with a 0 or 80% forging. Something about converting a rifle to a pistol, I dunno.

Once you can machine somebody else's forging, you can take a stab at casting them yourself. Nothing like making a gun out of recycled aluminum


erronious. you can buy a sig p556 from several vendors and the y are more than happy to make the needed mods.
but it is one way to do it.


I thought they had to be transferred as single shot or something?
phurba  [Life Member]
8/5/2010 2:11:16 AM
I milled a jig out of foam for the left side of the receiver tonight.. I'll post some pics when I get home and see how it fits. If all goes to plan, I'll mill another foam one for the other side, then I'll make a set out of aluminum.
phurba  [Life Member]
8/6/2010 2:51:35 AM
Sorry for the 24 hour delay.

Here's what I made yesterday:






CAD files home-rolled from a blueprint in rhino then routed in cut 3d and milled on a Techno Isel LC 5024.

This is the mock-up for the driver cheek jig. Working on the passenger cheek jig tonight. If it goes well in foam I'll mill it out of aluminum and start working on the cutout code.
JustKeepSwimming  [Member]
8/6/2010 3:57:13 PM
Is this mockup for a fixture to hold an 80% forging? I assume it's not for a 0% forging because you included that ear that slips into the bolt catch slot. Or does it? In the top photo it looks too thick to fit in the slot. Some kind of locating lug?

Regardless, it looks like you have enough mill-fu to end up with a working lower. Carry on!
phurba  [Life Member]
8/6/2010 3:58:40 PM
Is anybody interested in a new thread for tracking my progress?
phurba  [Life Member]
8/6/2010 4:00:32 PM
Originally Posted By JustKeepSwimming:
Is this mockup for a fixture to hold an 80% forging? I assume it's not for a 0% forging because you included that ear that slips into the bolt catch slot. Or does it? In the top photo it looks too thick to fit in the slot. Some kind of locating lug?

Regardless, it looks like you have enough mill-fu to end up with a working lower. Carry on!


Actually that ear doesn't slip into the bolt catch, it's just a shitty picture. It just goes between the bolt catch and the bump on the magwell. I don't have any 0% forgings handy but I'm going to order some soon.
JustKeepSwimming  [Member]
8/6/2010 4:07:05 PM
I vote for a new thread. The OP in this thread has already said he's bailing on the idea of making a lower from 80% and everybody fabs their 0% a little different depending on what they have to work with. It's always good to find a few new ideas when you're doing a search.

Think of a good subject title, for future searchers. The arfcom search throws up on you if you try to search for "0%"
phurba  [Life Member]
8/6/2010 4:15:24 PM
Originally Posted By JustKeepSwimming:
I vote for a new thread. The OP in this thread has already said he's bailing on the idea of making a lower from 80% and everybody fabs their 0% a little different depending on what they have to work with. It's always good to find a few new ideas when you're doing a search.

Think of a good subject title, for future searchers. The arfcom search throws up on you if you try to search for "0%"


Ok, I'll start a new thread this weekend after coming up with a good title and I'll link it here.

pyro6988  [Team Member]
8/6/2010 4:27:03 PM
Originally Posted By phurba:
Sorry for the 24 hour delay.

Here's what I made yesterday:

http://pohl.ececs.uc.edu/~k/driver-cheek-jig.jpg

http://pohl.ececs.uc.edu/~k/driver-cheek-jig2.jpg


CAD files home-rolled from a blueprint in rhino then routed in cut 3d and milled on a Techno Isel LC 5024.

This is the mock-up for the driver cheek jig. Working on the passenger cheek jig tonight. If it goes well in foam I'll mill it out of aluminum and start working on the cutout code.


Damn that is pretty sweet.