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Old October 05, 2012, 13:15   #1
mingthemerciles
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80% Receiver

For the simple sake of boredom I purchased an 80% receiver. I work for a company with a complete machine shop and we were able to "reverse" engineer the remaining 20%. (barrel threads, feed ramps, locking shoulder hole, etc, etc) MAJOR PAIN IN THE ASS and I do not suggest it to ANYONE!!! probably the hardest gun build undertaking I have ever tried. AK, HK even an M1A reweld was easier than this nightmare ! And I assure you I will NEVER try it again.. I know now why DSA and others charge what they do for a receiver.
I threw together some misc. parts both inch and metric to have the ultimate frankenfal for testing purposes.. And it does actually function, albeit about 4 rounds so far.
I will post pics soon if I dont blow myself up between now and then.

In the mean time does anyone know what I have to stamp on the receiver to meet legal requirements ??? (ie. Joe Bag a Donuts FAL Disaster Ser#001) They fail to give you that info when you buy the 80% receiver and I am confident there is some ramification if I dont CMA...

Thanks !
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Old October 05, 2012, 13:19   #2
tywest
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builder
location
serial number

someone chime in if i missed something

your serial should be WECSOG 0001!!
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Old October 05, 2012, 13:57   #3
mingthemerciles
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Ya no kidding... I should get the Road Runner engraved on the side of the mag well
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Old October 05, 2012, 13:59   #4
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If you built it for yourself you don't have to put anything on the receiver. If you sell it then you have to mark it.
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Old October 05, 2012, 14:04   #5
tdb59
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Quote:
Originally Posted by tywest View Post

your serial should be WECSOG 0001!!

Or

PITA Mk1 Mod 0 A1
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Old October 05, 2012, 14:12   #6
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If you built it for yourself you don't have to put anything on the receiver. If you sell it then you have to mark it.
+1 .....

Go to the BATF website and look up a copy of their reg. There is a section on homemade guns.

Selling it is whole other matter that would require a professional legal opinion (IMHO).

There was another guy on here many years ago that did the same thing and documented it in a thread set-by-step. He put a lot of hours into it.
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Old October 05, 2012, 14:24   #7
tywest
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yes no marking required unless selling......the safer thing I would reckon would be to mark it, at least then if its stolen they have something to go by other than "no serial"
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Old October 05, 2012, 14:37   #8
mingthemerciles
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Trust me no worries on stealing... No one in there right mind would take this POS !
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Old October 05, 2012, 20:57   #9
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receiver

How did you heat treat it?
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Old October 05, 2012, 22:05   #10
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Sounds like you have done well with this chip maker. I'm still working on mine cast and front stub. Not the bell of the ball but its all mine. Will post some picks latter.
Btw, look up user name sprat. He did an 80% cast job.
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Old October 05, 2012, 23:24   #11
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More details, please! What made it difficult? What were the hard cuts? Was it hard to determine a reference point?
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Old October 06, 2012, 09:55   #12
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the cut in side the reciver LH side close to the breach I did not do, I just welded an old stube on that I had. now on with the show. so I cat post photos

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Old October 06, 2012, 19:30   #13
Lee Carpentieri
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80% Fal receiver

You really should engrave your First Initial, Last name, City and state. This way you have proof it's yours, If you get pulled over by the cops and they search your vehicle and don't have any info on the receiver if you have it with you, You have no proof it's yours without your name an address already on it. Also, Did you magnaflux the receiver before you even started machining it? Is it heat treated?
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Old October 06, 2012, 21:20   #14
mingthemerciles
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Wink

Worst part of the whole thing was the feed ramps and lips / rails for the magazine.
You have to determine the proper depth when drilling for the barrel also.
We have a 3D laser scanner and attempted to match it to a SAR-48 receiver that I have.
Obviously the cast dimensions were off somewhat so that was a PIA.
The CAD guy has a 3D printer and he basically printed a model of it.. its cost prohibitive as hell and ill probably get fired for all the time and expense we put into it do get a finished product. It still looks like shit in my book but I wanted to try. Again I can't stress enough PIA.. And I did heat treat it in our oven with a few dies.. I couldn't begin to know if it was done right unless I send it off for the Rockwell test and thats more $$$ that I'm blowing on company time.
shhhhhhh
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Old October 08, 2012, 11:34   #15
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Yeah I was a precision machinist 20+ years and I would not attempt it.

I could do it but it would not be worth my time.

I commend you for taking it on. Hope u dont loose your job.
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Old October 08, 2012, 14:30   #16
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Still looking forward to seeing pics...
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Old October 09, 2012, 04:26   #17
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ok, still can not post the photos . I dont want to join photo bucket. so how does one post photo's. muttman

one can go over to wepions guild and look.
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Old October 09, 2012, 09:49   #18
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I think you can just link from here unless weapons guild blocks it.. lets try..





Not sure your method of welding on a receiver stub is any easier than just machining the thing.. I would think that all you need to do is get the dimension of all the receiver rail cuts in relation to the center of the barrel bore and the face of the barrel. Not as complicated as it seems but the machine time still makes it not worth it.
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Old October 09, 2012, 10:00   #19
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ok, still can not post the photos . I dont want to join photo bucket. so how does one post photo's. muttman

one can go over to wepions guild and look.
Can't look at anything over there without being a member & def90s link didn't work. To post pics directly from your hard drive on here you have to be a contributor. There are other picture hosting sites besides photobucket. Is there a reason you don't want to use one of them ?
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Old October 09, 2012, 16:17   #20
muttman
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nothing other than "one more thing " to deal with. I can send them to you or def can copy and send just pm me and I send after work.

the labor time on this one for me is not an issue with me. if you google "fal reweld" you will find sombody has rewelded a cut up one and has only 10 hr in to it. the hard part right now is cutting the slots for the charging handel, so far I have not found a 5/16" dia. 1/16" key cutter, mine is .32" dia. so I may go with a over size charging handel. I just got a new front stub to day to make a #2 with.

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Last edited by muttman; October 09, 2012 at 16:20. Reason: add to
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Old October 14, 2012, 12:58   #21
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I will post pics soon if I dont blow myself up between now and then.
So I guess it's safe to assume you have managed to blow yourself up ?
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Old October 14, 2012, 21:36   #22
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So I guess it's safe to assume you have managed to blow yourself up ?
If he did I hope he did not say the magic blessing
" yall watch this". Muttman
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Old December 30, 2012, 15:41   #23
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I'm gonna resurrect this thread for one of my patented dummy questions.

Why is 80% the standard for unfinished receivers? Why not 99% or 95%?

On the 80% FAL receivers why are the threads one operation that's omitted? Couldn't they do the difficult stuff and leave the more simple operations for the end user?

IOW, I've seen some real dummies build AR's, why don't they gear the FAL to the same market?
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Old December 30, 2012, 16:27   #24
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80% is the point where ATF has determined its NOT yet receiver.


As to why not do the hard cuts?? My best guess is because companies do NOT plan on making and selling 80% receivers.
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