AR15.Com Archives
 is it really this easy to complete a 80% lower ?
1911greg  [Member]
11/19/2005 10:36:25 AM EST
jig

Thats all it takes? Just start drilling holes in the receiver? I have a good set of bits but no drill press??

Then you just add a parts kit and you are good to go?

thanks-
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w4klr  [Team Member]
11/19/2005 9:24:42 AM EST
You are going to have to do some finishing work to it as well, but I guess it is pretty easy to do...
olyarms  [Team Member]
11/19/2005 9:38:01 AM EST
Youll most def need a drill press at the least.
river_rat  [Member]
11/19/2005 9:49:46 AM EST
Why do you have two threads going on this? This is what I posted in the other thread.

The only way to do it correctly is with a good mill. Using a hand drill or even a drill press will result in out of spec holes in both location and size. Marketing ploy is all your seeing IMHO and I am a machinist.
50cal  [Team Member]
11/19/2005 9:57:35 AM EST
The broach to cut the magwell isn't cheap.

Oops, you said 80% lower. Still, you will need a good manual machine and a good set of prints. None of this "Drill hole about here" crap.
kar98k  [Team Member]
11/19/2005 10:09:13 AM EST
www.riflewarrior.com/building_the_kristi_tool.htm
NightWatchman  [Team Member]
11/19/2005 10:25:53 AM EST
Quality finished lowers seem so cheap anyway. How much would a 80% finished lower go for? I suppose someone would do this for fun not for savings.
50cal  [Team Member]
11/19/2005 10:28:51 AM EST

Originally Posted By NightWatchman:
Quality finished lowers seem so cheap anyway. How much would a 80% finished lower go for? I suppose someone would do this for fun not for savings.



Dealer price for a good lower usually runs $90. WHy do all the work in finishing the 80% lower and still have to have it annodized for a hefty minimum charge is kind of crazy. But there are plenty of "I don't want anyone to know I have it" types out there.
Paul  [Site Staff]
11/19/2005 10:34:43 AM EST

Originally Posted By river_rat:
Why do you have two threads going on this? This is what I posted in the other thread.

The only way to do it correctly is with a good mill. Using a hand drill or even a drill press will result in out of spec holes in both location and size. Marketing ploy is all your seeing IMHO and I am a machinist.



Oddly enough my weapons work just fine and I didn't even have to use my mill. My out of spec holes in both location and size (?) have functioned just fine in all four weapons sending thousands of rounds into the target as desired. It's a lower not a nuclear power plant, rocket motor, or satellite circuit.

Can you explain what is going to happen if the firing pin is 0.001" futher aft or canted by 15 minutes of angle from centerline? The hammer is going to hit the firing pin which is going to ignite the primer and the weapon is going to work not knowing the difference. Ever look at the tollerances on an SKS?

There are thousands of people who have had sucess with building their own weapons using nothing more that a jig, drill press, a tapper, and a handful of apparently wrong sized drill bits. I dare say that I did a better job than Hesse Inc. did on one of my commerically bought lowers manufactured on a mill!

Paul  [Site Staff]
11/19/2005 10:36:03 AM EST

Originally Posted By NightWatchman:
Quality finished lowers seem so cheap anyway. How much would a 80% finished lower go for? I suppose someone would do this for fun not for savings.



The price of tools and the lower itself is about $525.

Having a lower (or five or six) without a serial number is priceless!
1911greg  [Member]
11/19/2005 10:44:07 AM EST

Originally Posted By Paul:

Originally Posted By river_rat:
Why do you have two threads going on this? This is what I posted in the other thread.

The only way to do it correctly is with a good mill. Using a hand drill or even a drill press will result in out of spec holes in both location and size. Marketing ploy is all your seeing IMHO and I am a machinist.



Oddly enough my weapons work just fine and I didn't even have to use my mill. My out of spec holes in both location and size (?) have functioned just fine in all four weapons sending thousands of rounds into the target as desired. It's a lower not a nuclear power plant, rocket motor, or satellite circuit.

Can you explain what is going to happen if the firing pin is 0.001" futher aft or canted by 15 minutes of angle from centerline? The hammer is going to hit the firing pin which is going to ignite the primer and the weapon is going to work not knowing the difference. Ever look at the tollerances on an SKS?

There are thousands of people who have had sucess with building their own weapons using nothing more that a jig, drill press, a tapper, and a handful of apparently wrong sized drill bits. I dare say that I did a better job than Hesse Inc. did on one of my commerically bought lowers manufactured on a mill!

photos.ar15.com/ImageGallery/Attachments/DownloadAttach.asp?iImageUnq=4193



thanks Paul, is that a CNC 80percent?
fizassist  [Team Member]
11/19/2005 10:48:35 AM EST

Originally Posted By 50cal:

Originally Posted By NightWatchman:
Quality finished lowers seem so cheap anyway. How much would a 80% finished lower go for? I suppose someone would do this for fun not for savings.



Dealer price for a good lower usually runs $90. WHy do all the work in finishing the 80% lower and still have to have it annodized for a hefty minimum charge is kind of crazy. But there are plenty of "I don't want anyone to know I have it" types out there.



You know, there are also a lot of "we just like to build stuff" people out here. Nobody in their right mind is going to build an 80% lower just to avoid a paper trail.
river_rat  [Member]
11/19/2005 11:26:59 AM EST

Originally Posted By Paul:

Originally Posted By river_rat:
Why do you have two threads going on this? This is what I posted in the other thread.

The only way to do it correctly is with a good mill. Using a hand drill or even a drill press will result in out of spec holes in both location and size. Marketing ploy is all your seeing IMHO and I am a machinist.



Oddly enough my weapons work just fine and I didn't even have to use my mill. My out of spec holes in both location and size (?) have functioned just fine in all four weapons sending thousands of rounds into the target as desired. It's a lower not a nuclear power plant, rocket motor, or satellite circuit.

Can you explain what is going to happen if the firing pin is 0.001" futher aft or canted by 15 minutes of angle from centerline? The hammer is going to hit the firing pin which is going to ignite the primer and the weapon is going to work not knowing the difference. Ever look at the tollerances on an SKS?

There are thousands of people who have had sucess with building their own weapons using nothing more that a jig, drill press, a tapper, and a handful of apparently wrong sized drill bits. I dare say that I did a better job than Hesse Inc. did on one of my commerically bought lowers manufactured on a mill!

photos.ar15.com/ImageGallery/Attachments/DownloadAttach.asp?iImageUnq=4193



Some people have mechanical ability and some can't boil water. Would you recommend that everybody make their own lowers? But then if they did wouldn't the Troubleshooting Forum be interesting. I still wouldn't recommend it for just anybody. If I knew they had ability and could say " I sure fucked that up" if they screwed it up and toss it, then ok go for it.

As far as Hesse, well we already know how good they are. Manufacturers unfortunately hire the can't boil water types and then wonder why they have quality problems.
1911greg  [Member]
11/19/2005 11:46:11 AM EST
I love to build stuff and my dad was a machinest as a hobby a few years back so tools such as dial calipers, files, emory cloth, drills, taps shouldn't be a problem!!!
river_rat  [Member]
11/19/2005 11:50:54 AM EST

Originally Posted By 1911greg:
I love to build stuff and my dad was a machinest as a hobby a few years back so tools such as dial calipers, files, emory cloth, drills, taps shouldn't be a problem!!!



Hey if you think you can do then give it a try. I hope it works out well. Just take your time and pay attention to what you are doing.
bloodsport2885  [Team Member]
11/19/2005 12:57:15 PM EST
Try building AK's first if your in it just for the building aspect. The hobby has seen quite a few new tools and whatnot lately. Kits are cheap and if you ruin a $15.00 flat I bet youd be a lot less upset than an %80 forging.
pyro6988  [Team Member]
11/19/2005 1:06:05 PM EST

Originally Posted By fizassist:

Nobody in their right mind is going to build an 80% lower just to avoid a paper trail.



The tinfoil hat crowd certainly does.
Timinem  [Member]
11/19/2005 4:59:37 PM EST
Or if your a felon?




sorry someone had to say it.
GhostRing  [Team Member]
11/19/2005 6:35:24 PM EST
I doubt a felon is going to go through the mechanical trouble to produce a lower.
They'll get a complete weapon "elsewhere"...

ar15club  [Member]
11/20/2005 8:48:47 AM EST
i am thinking about 80% rec with jig from cncgunsmithing
but i am scared from buffer tube !



Quote From CNCGUNSMITHING page
These blocks are so EASY to use, that you can finish out your receiver using little more than a cordless drill with the proper drill bits. No matter what side of the receiver you need to machine or drill, these setup blocks will insure you hold your receiver flat and square every time.



i do not have mill, i just have drill press. if i try i`ll post pics and a million of stupid questions
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