Is anybody building using the original rec? I've got my back 2 sections cleaned up and the end cap threaded on. The front looks doable but rebuilding the mag catch looks like a major p.i.t.a.! Also what is the difference between the kits with the MB and w/o? I kinda prefer mine w/o.

You should not use the original ID for a receiver.

I can't imagine using my original recievers, they are complete toast!

Not to mention, using the old receiver is completely ILLEGAL!!!!

USMCsean8531 wrote: Not to mention, using the old receiver is completely ILLEGAL!!!!

And what is your basis for this statement?  Once a receiver is demilled, it is no longer a firearm item.  It may then be put back together if the proper steps are taken to ensure it can not be used as a class III.  That is what the Bren welding is all about.  I wouldn't recommend doing it, just as Gary stated, it isn't good to use origional diameter.  However a rail inside the receiver to prevent a full auto bolt would probably meet that criteris.  There are more than a few rewelded M14s and Brens that are perfectly legal as well as others I am sure

You could use the old receiver, but the trick is rewelding it and a SA blocking rail at the same time.

You cannot weld up the receiver, and then install the blocking rail (that would be making a machine gun).  if you rewelded it like a Bren (with the rail installed at the same time) then it would be legal.

BUT...  it would still have to fire from the closed bolt, so all the other semi, mods would have to be done, just like using a reduced tube.

922r would apply if it's a rifle, and if it's going to be an SBR you could not finish the weapon until your tax stamp has been approved.

so yes, it's possible, but the build order can be tricky.

 

Such patience.     MB ... we need to learn some.   

I apologize if I am misinformed. Anyone I've ever talked to has told me that using a receiver from a machine gun was illegal. Quoting the "once a machine gun, always a machine gun" addage. No matter if it was cut and put back together, it was still a machine gun.

I have no problem with being wrong. Makes an excellent platform for a good lesson.

The Prexis receivers are so nice that I cannot imagine the effort required to weld up and reuse the original receiver. Time wise, together with quality issues, makes the effort difficult to justify not to mention legal questions.

tommerr wrote: The Prexis receivers are so nice that I cannot imagine the effort required to weld up and reuse the original receiver. Time wise, together with quality issues, makes the effort difficult to justify not to mention legal questions.

I agree 100%

I apologize if I sounded a bit harsh, I just get upset when I hear quotes that are not exactly the straight facts.  Gary puts it pretty straight forward, it would be a PITA to do, but it is doable.  I am taking the easy way with Prexis receivers on my builds and Tommerr's superb machine work for any mods.  That or stuff like the WLA buy on the PPSH.  If you read enough posts, one thing you will notice is that 99.99% of the guys on here are doing their best to ensure they do not break any of the laws and or rulings that will land their rear in jail.  It just isn't worth it.  You can buy a transferable class III weapon for less than the legal fees will be if you get caught with/making an illegal one.  Not to mention the consequenses if/when you lose!   

Is it silly to think that you could make a tight tolerance internal jig to weld these things back together? I am thinking steel with a copper sleeve?

All that would be needed is to get rid of the quick take down,stop the Full auto bolt from being able to enter the receiver,  disable trip sear(?), and make closed bolt operation? Right?

I was thinking a welded pin or keyway type of obstruction so no standard bolt. Then grind in a channel on the bolt along with ar15 FCG conversion. Then, worry about the other compliance issues.

Dont get me wrong, for my first I have already put my order in for the Prexis set up with Tommers break down mod. For my 2nd adventure I want to try to fix it back up(receiver).

Also, If I was to weld it back together successfully or resleeve for a smaller diameter bolt is it then considered a US made part? Maybe more with the sleaving? I did read tommers experience with the bolt conversion. Maybe some welding and a sleeve might fit the bill?

You will have to excuse me .....I am only on page 84 of the thread.

I am in the process of turning the thread into a PDF so I can print it out(there is a printing shop in the building). If there is interest, I can submit it?

You cannot weld up the receiver, and then install the blocking rail (that would be making a machine gun).  if you rewelded it like a Bren (with the rail installed at the same time) then it would be legal.

So then, Jumnara (or however you say his name) build of a Bren is totally illegal the way it was pictured? He clearly shows welding the reciever up and then....then cutting the piece out of the side to weld in the blocking rail. So I guess you are saying that if while in the process of building your SEMI Bren and just before cutting the slot for the blocking rail the ATF could come crashing in with guns blazing becuase technically at that moment they consider it a machine gun??

 

1916holton wrote: You cannot weld up the receiver, and then install the blocking rail (that would be making a machine gun).  if you rewelded it like a Bren (with the rail installed at the same time) then it would be legal. So then, Jumnara (or however you say his name) build of a Bren is totally illegal the way it was pictured? He clearly shows welding the reciever up and then....then cutting the piece out of the side to weld in the blocking rail. So I guess you are saying that if while in the process of building your SEMI Bren and just before cutting the slot for the blocking rail the ATF could come crashing in with guns blazing becuase technically at that moment they consider it a machine gun??

with the Jumanra jigs you are welding the blocking rail at the same time as welding up the receiver.

Dhamlin,

Considering the quality control problems encountered during a receiver reweld, that alone would persuade me to never do it. Mike's receivers very good and inexpensive. Considering the time, the cost and the effort, I will never attempt a reweld.

I did extensive alterations to my Suomi bolt before submiting it to the BATFE. They do not consider it US made.

All the Best

Tom

Tommerr, 1st I want to thankyou for th HARD work and time you have put in to the projects.

.I want to piece 1 together from 2 kits. Like I said I would like to try. Maybe I will bore and sleeve it ,who knows. I do have a receiver comming from mike. I will then have 2 torched receivers. Maybe I can make 1 out of them. Also, maybe there could be another jig floating around. Also, is there any chance of me getting some bolt punches?

With the pressures of the gun being against the bolt and in the barrel, how could boring and sleeving be bad? Not saying it makes monetary sense, most of the builds dont.  I would like to see if it would work.

Can you elaborate a little on the issues you are talking about? I did read the posts on your bolt. Its a bummer that they didnt consider it US made. I wonder if they would feel the same about about a re sleeved receiver?. I dont really care, although it would be nice...

Anyhow, thanks again

Dhamlin,

Because the Suomi receivers were legally destroyed, they are no longer considered a foreign made part. I made two filing fixtures. One is mine and one I loan out to people. Each jig took about 50 hours of hand work to build. I will put you on the punch list. Like the filing jig, I hand made the punches.

Tom

So on the topic of reduced id receivers...

Would it be logical to order some steel tubing from aircraft spruce that has a slightly smaller id, then getting the bolt turned down to be able to fit inside the tube?

  mikey-mick, thats what I did. I used 1.5"x.188 wall thickness which gives you a smaller inside diameter and I used a 1.25".x.250" wall thickness piece to make the barrel bushing back to the step in the bolt. I'll be putting the photos in my 870 fcg thread eventually but heres the link to it over at gunco http://www.gunco.net/forums/f245/sgn-9-a-37899/index16.html

 

Here's a trick I found. I did my build before stumbling on any websites. Didn't realise this was so comman but anyway. Regular copper pipe for a backing works great. I cant remember off the top of my head what size but the actual pipe is to small but if you solder a coupling on the end and polish probable 15 20 thousandth off the .OD it will fit perfect and align everything straight. then you can weld right over the copper to fill any gaps and it will give you a nice finish inside that takes very little attention after. just leave the pipe long enough for a little leverage to get it out. one of my joints required a screw drive thru the pipe to pull on . I'm thinking it was inch and a half Ill check next time i'm in the shop.