Calguns.net  

Home My iTrader Join the NRA Donate to CGSSA Sponsors CGN Google Search
CA Semiauto Ban(AW)ID Flowchart CA Handgun Ban ID Flowchart CA Shotgun Ban ID Flowchart
Go Back   Calguns.net > INTERESTS AND ACTIVITIES > Gunsmithing & How To
Register FAQ Members List Calendar Mark Forums Read

Gunsmithing & How To Pro, Amateur & WECSOG and Tutorials, Guides & OLL Build Instructions

Reply
 
Thread Tools Display Modes
  #1  
Old 05-31-2013, 2:29 PM
Kiwi's Avatar
Kiwi Kiwi is offline
Senior Member
 
Join Date: Oct 2012
Location: Riverbank
Posts: 544
iTrader: 0 / 0%
Default Semi Auto BREN MKII Build



Teaser for the next build. I have built MKI's before but this will be my first MKII. Not a huge difference inside and I will be using some semi auto parts from other manufacturers left over from prior builds and some parts I will show you how to make by hand. As you can see this is a standard inglis kit from 1945. The thing to remember when picking a torch cut kit is the cuts. Yes you can rebuild the MGS kits with a lot of time and effort but it is really frustrating. I stopped accepting MGS kits. IMA sells nicely cut kits and you can sometimes find gems on GB, that's where I found this one. Seeing I am building two of these one an IMA kit I will show you how I repair the front section on that seeing its cut different to this one.
Reply With Quote
  #2  
Old 05-31-2013, 9:04 PM
cactus's Avatar
cactus cactus is offline
Senior Member
 
Join Date: Feb 2007
Location: Foresthill CA
Posts: 1,451
iTrader: 184 / 100%
Default

I cant wait!!!!
Reply With Quote
  #3  
Old 05-31-2013, 9:04 PM
cactus's Avatar
cactus cactus is offline
Senior Member
 
Join Date: Feb 2007
Location: Foresthill CA
Posts: 1,451
iTrader: 184 / 100%
Default

If your making your own jig im interested in demensions.
Reply With Quote
  #4  
Old 05-31-2013, 9:21 PM
milw50717's Avatar
milw50717 milw50717 is offline
Senior Member
 
Join Date: Jan 2006
Posts: 647
iTrader: 16 / 100%
Default

sweet
Reply With Quote
  #5  
Old 06-01-2013, 11:28 AM
grossekatz's Avatar
grossekatz grossekatz is offline
Member
 
Join Date: Mar 2008
Location: Tujunga, Ca
Posts: 336
iTrader: 17 / 100%
Default

Great timing, I'll have a kit on Thursday.
Reply With Quote
  #6  
Old 06-01-2013, 12:33 PM
Kiwi's Avatar
Kiwi Kiwi is offline
Senior Member
 
Join Date: Oct 2012
Location: Riverbank
Posts: 544
iTrader: 0 / 0%
Default



This is the jig I will be using. I bought this jig a couple years back and worth every penny. I have already built two MKI's using this set up and it works well. What dimensions did you need?
Reply With Quote
  #7  
Old 06-01-2013, 12:44 PM
base64's Avatar
base64 base64 is offline
Member
 
Join Date: Feb 2009
Location: Unincorporated, CA
Posts: 362
iTrader: 12 / 100%
Default

That kit looks great, can't wait to see it come together!
Reply With Quote
  #8  
Old 06-02-2013, 9:35 AM
Kiwi's Avatar
Kiwi Kiwi is offline
Senior Member
 
Join Date: Oct 2012
Location: Riverbank
Posts: 544
iTrader: 0 / 0%
Default



The first thing we need to do is get the parts kit all cleaned up. these are usually coated in a thick grease which is in every nook and cranny. I completely disassemble the parts kit and clean every part with lacquer thinner. At this stage I also inspect every part to ensure they are serviceable, not broken, and that all the parts are actually there. Some of the parts you will need to make improvised tools to remove. This is the buffer area on the lower. To remove the buffer plate there is a locking nut that has a long narrow slot which I did not have a screwdriver that would fit.
Reply With Quote
  #9  
Old 06-02-2013, 9:46 AM
Kiwi's Avatar
Kiwi Kiwi is offline
Senior Member
 
Join Date: Oct 2012
Location: Riverbank
Posts: 544
iTrader: 0 / 0%
Default



this is one of the improvised tools I made. I also made one to disassemble the carry handle.
Reply With Quote
  #10  
Old 06-02-2013, 10:28 AM
Kiwi's Avatar
Kiwi Kiwi is offline
Senior Member
 
Join Date: Oct 2012
Location: Riverbank
Posts: 544
iTrader: 0 / 0%
Default



I also remove the gas piston at this point seeing we will not be using this one. Instead it will be replaced with a US made part for 922r. Be carful this pin only comes out one way. I drilled the riveted end so that it would clear the chamfer on the hole then knocked it out. I will later turn a replacement pin on the lathe. Sometimes you can just knock these through and there is still enough pin left to be reinstalled.

Last edited by Kiwi; 06-02-2013 at 10:33 AM..
Reply With Quote
  #11  
Old 06-02-2013, 10:36 AM
Kiwi's Avatar
Kiwi Kiwi is offline
Senior Member
 
Join Date: Oct 2012
Location: Riverbank
Posts: 544
iTrader: 0 / 0%
Default



This is what the kit looks like after disassembly, cleaning and inspection. I still need to remove the bipod mounting point and gas shield from the front section if the receiver.
Reply With Quote
  #12  
Old 06-02-2013, 10:41 AM
Kiwi's Avatar
Kiwi Kiwi is offline
Senior Member
 
Join Date: Oct 2012
Location: Riverbank
Posts: 544
iTrader: 0 / 0%
Default



Now I reassemble the parts I know that are not effected by the rebuilding or semi conversion and put aside any other parts that will be replaced by US parts for 922r.
Reply With Quote
  #13  
Old 06-02-2013, 10:49 AM
Kiwi's Avatar
Kiwi Kiwi is offline
Senior Member
 
Join Date: Oct 2012
Location: Riverbank
Posts: 544
iTrader: 0 / 0%
Default



And finally I get around to disassembling the front section of the receiver. This can be trying. Its a taper pin and they are usually in there pretty good. You will need to determine the narrow end to push from. Ideally using a press to remove this would be best however it a narrow pin and the piece is hard to get solid in the press. If I do any more of these I will probably make a jig to hold it. For right now I use a punch and tap it loose. Takes a little while but it will work loose with minimal damage to the pin if you take your time and be careful.
Reply With Quote
  #14  
Old 06-02-2013, 11:07 AM
Kiwi's Avatar
Kiwi Kiwi is offline
Senior Member
 
Join Date: Oct 2012
Location: Riverbank
Posts: 544
iTrader: 0 / 0%
Default



Now I have been talking about 922r parts and other mfg.'s parts. These are US made semi / 922r parts I got from Project Guns a few years back that have been sitting around in my shop. They consist of a semi firing pin, gas piston, op rod, mag floor plate, striker spring ( forgot to put the striker in the photo), and us made trigger. All this counts as 5 922r parts. Now you can make everything you see here if you have access to machines. Making it yourself will lower your cost but it will also increase the time you have into the build. Sometimes its easier to use existing parts rather than reinventing the wheel but that's up to you to decide. Seeing I am building two of these I will need to make an extra trigger that I am waiting for steel to show up for. Project guns no longer sells these parts, or at least does not advertise them, however wise lite does make some of them, most importantly they make a mag follower which would give you another 922r part. I am not a huge fan of the floor plate so I will be showing another option for that. When it comes to which conversion to use there are different ATF approved designs. I had these parts so no point in not using them, however the Mathews design from shotgun news is in my opinion a better design and will be doing that one for the second gun.

Last edited by Kiwi; 06-02-2013 at 11:10 AM..
Reply With Quote
  #15  
Old 06-02-2013, 11:45 AM
Kiwi's Avatar
Kiwi Kiwi is offline
Senior Member
 
Join Date: Oct 2012
Location: Riverbank
Posts: 544
iTrader: 0 / 0%
Default



Ok lets get down to it. First thing I like to do on any build is get rid of those full auto features. So here I have separated the parts we will be modifying.
Reply With Quote
  #16  
Old 06-02-2013, 11:53 AM
Kiwi's Avatar
Kiwi Kiwi is offline
Senior Member
 
Join Date: Oct 2012
Location: Riverbank
Posts: 544
iTrader: 0 / 0%
Default



Here is the disconnector. You must grind the bottom lip off so it is flush.
Reply With Quote
  #17  
Old 06-02-2013, 11:54 AM
Kiwi's Avatar
Kiwi Kiwi is offline
Senior Member
 
Join Date: Oct 2012
Location: Riverbank
Posts: 544
iTrader: 0 / 0%
Default



here it is completed
Reply With Quote
  #18  
Old 06-02-2013, 11:56 AM
Kiwi's Avatar
Kiwi Kiwi is offline
Senior Member
 
Join Date: Oct 2012
Location: Riverbank
Posts: 544
iTrader: 0 / 0%
Default



Side by side comparison of a semi auto (left) and a full auto (right)
Reply With Quote
  #19  
Old 06-02-2013, 12:05 PM
Kiwi's Avatar
Kiwi Kiwi is offline
Senior Member
 
Join Date: Oct 2012
Location: Riverbank
Posts: 544
iTrader: 0 / 0%
Default



Here is the sear. You will need to remove the angled notch at the bottom. This is really hard steel and sometimes a file will do it but usually I use a dremel and grind it out.
Reply With Quote
  #20  
Old 06-02-2013, 12:06 PM
Kiwi's Avatar
Kiwi Kiwi is offline
Senior Member
 
Join Date: Oct 2012
Location: Riverbank
Posts: 544
iTrader: 0 / 0%
Default



Here is another shot of the angled part that needs to be removed.
Reply With Quote
  #21  
Old 06-02-2013, 12:07 PM
Kiwi's Avatar
Kiwi Kiwi is offline
Senior Member
 
Join Date: Oct 2012
Location: Riverbank
Posts: 544
iTrader: 0 / 0%
Default



Here it is removed.
Reply With Quote
  #22  
Old 06-02-2013, 12:08 PM
Kiwi's Avatar
Kiwi Kiwi is offline
Senior Member
 
Join Date: Oct 2012
Location: Riverbank
Posts: 544
iTrader: 0 / 0%
Default



Full auto on the left, semi auto on the right
Reply With Quote
  #23  
Old 06-02-2013, 7:57 PM
RobGR's Avatar
RobGR RobGR is offline
Veteran Member
 
Join Date: May 2010
Location: San Diego
Posts: 2,879
iTrader: 36 / 100%
Default

You lost my FFLs mailing address right? No worries, I'll PM it to you so you can mail the Bren MKII directly to them when you are done.

(I wish)

Look forward to seeing the progress, as always.
__________________

"If the American people ever allow private banks to control the issue of their currency, first by inflation, then by deflation, the banks & corporations that will grow up around them will deprive the people of all property until their children wake up homeless on the continent their Fathers conquered. The issuing power should be taken from the banks and restored to the people, to whom it properly belongs."

KrisAnne Hall on Oregon

"I am sullied - no more" Col. Ted Westhusing
Reply With Quote
  #24  
Old 06-04-2013, 7:25 AM
cactus's Avatar
cactus cactus is offline
Senior Member
 
Join Date: Feb 2007
Location: Foresthill CA
Posts: 1,451
iTrader: 184 / 100%
Default

Thanks for all the info. I was thinking of making my own jig. Its probably easier to buy one. I have a kit that is in bad shape. I bought it only to find out the previos owner never cleaned the slag and attempted to weld it back together with flux core. Never even cleaned the demill cuts.
Reply With Quote
  #25  
Old 06-04-2013, 10:07 AM
Kiwi's Avatar
Kiwi Kiwi is offline
Senior Member
 
Join Date: Oct 2012
Location: Riverbank
Posts: 544
iTrader: 0 / 0%
Default

Jigs are not difficult to make. I have made them for the mg34 and intend to make them for the 42, dp28, and sg43. You used to see more for rent but I think people are hanging on to them more these days. Yikes....that will be a pain to rebuild...doable, but the 4 lettered expletives will be flying
Reply With Quote
  #26  
Old 06-04-2013, 10:16 AM
Kiwi's Avatar
Kiwi Kiwi is offline
Senior Member
 
Join Date: Oct 2012
Location: Riverbank
Posts: 544
iTrader: 0 / 0%
Default



Here you an see an original trigger on the right and a projectguns trigger on the left. I need a second trigger that I will make myself which I am waiting on steel to show up for, once it gets here I will show to make that yourself.
Reply With Quote
  #27  
Old 06-04-2013, 10:21 AM
Kiwi's Avatar
Kiwi Kiwi is offline
Senior Member
 
Join Date: Oct 2012
Location: Riverbank
Posts: 544
iTrader: 0 / 0%
Default



Next we can move onto modifying the lower. First thing we do is remove 1.25 inches from the front of the rail on both sides. We will weld up the same amount of rail on the inside of the receiver stopping a full auto receiver from being installed.
Reply With Quote
  #28  
Old 06-04-2013, 10:23 AM
Kiwi's Avatar
Kiwi Kiwi is offline
Senior Member
 
Join Date: Oct 2012
Location: Riverbank
Posts: 544
iTrader: 0 / 0%
Default



And here it is completed. This can be done with a hand grinder and large file.
Reply With Quote
  #29  
Old 06-04-2013, 10:24 AM
Kiwi's Avatar
Kiwi Kiwi is offline
Senior Member
 
Join Date: Oct 2012
Location: Riverbank
Posts: 544
iTrader: 0 / 0%
Default



Then on to the other side
Reply With Quote
  #30  
Old 06-04-2013, 10:26 AM
Kiwi's Avatar
Kiwi Kiwi is offline
Senior Member
 
Join Date: Oct 2012
Location: Riverbank
Posts: 544
iTrader: 0 / 0%
Default



and we are all done with that now we can block the selector switch.
Reply With Quote
  #31  
Old 06-04-2013, 12:41 PM
Kiwi's Avatar
Kiwi Kiwi is offline
Senior Member
 
Join Date: Oct 2012
Location: Riverbank
Posts: 544
iTrader: 0 / 0%
Default



Here is the are where we will block the selector. The middle position is safe to the rear is semi and all the way forward is auto. We have to block it so it move forward of the center position. I have in the past welded a block in that I shaped to match the receiver, but all that is not needed. Instead this time I will permanently install a cap screw to stop forward movement.
Reply With Quote
  #32  
Old 06-04-2013, 12:43 PM
Kiwi's Avatar
Kiwi Kiwi is offline
Senior Member
 
Join Date: Oct 2012
Location: Riverbank
Posts: 544
iTrader: 0 / 0%
Default



There is no real spot to put it in just install it in a place that looks good and so that is can do its job. I simply centered it on the selector lever and a little in front of it.
Reply With Quote
  #33  
Old 06-04-2013, 12:45 PM
Kiwi's Avatar
Kiwi Kiwi is offline
Senior Member
 
Join Date: Oct 2012
Location: Riverbank
Posts: 544
iTrader: 0 / 0%
Default



Next I drill and tapped the hole.
Reply With Quote
  #34  
Old 06-04-2013, 12:55 PM
CAL.BAR CAL.BAR is offline
CGSSA OC Chapter Leader
 
Join Date: Nov 2007
Location: South OC
Posts: 3,830
iTrader: 7 / 100%
Default

You may wish to convert that from .303 (very expensive and hard to find) to 7.62x54R (very cheap and very easy to find)

And if you do convert it, you need to get some ZB-39 mags that will accept the 54R cartridge more readily.
Reply With Quote
  #35  
Old 06-04-2013, 7:10 PM
Kiwi's Avatar
Kiwi Kiwi is offline
Senior Member
 
Join Date: Oct 2012
Location: Riverbank
Posts: 544
iTrader: 0 / 0%
Default

Quote:
Originally Posted by CAL.BAR View Post
You may wish to convert that from .303 (very expensive and hard to find) to 7.62x54R (very cheap and very easy to find)

And if you do convert it, you need to get some ZB-39 mags that will accept the 54R cartridge more readily.
Its like you read my mind. I actually will be building a caliber conversion at the end of this build. I will be using a spare MK1 barrel I have and a dark colored bolt to be able to tell the 54r parts. Still need to get some mags though. I was thinking about converting a .303 mag but when I thought about it the ZB-39 mags would set themselves apart from the .303 just like the rest of the caliber conversion
Reply With Quote
  #36  
Old 06-04-2013, 9:11 PM
Kiwi's Avatar
Kiwi Kiwi is offline
Senior Member
 
Join Date: Oct 2012
Location: Riverbank
Posts: 544
iTrader: 0 / 0%
Default



Here the screw is installed. I chose the cap screw so that I could later weld up or fill the head and dress it up a bit
Reply With Quote
  #37  
Old 06-05-2013, 6:58 AM
Kiwi's Avatar
Kiwi Kiwi is offline
Senior Member
 
Join Date: Oct 2012
Location: Riverbank
Posts: 544
iTrader: 0 / 0%
Default



As you can see with the selector installed a simple screw works well.
Reply With Quote
  #38  
Old 06-05-2013, 7:00 AM
Kiwi's Avatar
Kiwi Kiwi is offline
Senior Member
 
Join Date: Oct 2012
Location: Riverbank
Posts: 544
iTrader: 0 / 0%
Default



This screw needs to be permanently installed. I need to cut the screw back leaving it long enough to be able to weld it to the inside.
Reply With Quote
  #39  
Old 06-05-2013, 7:01 AM
Kiwi's Avatar
Kiwi Kiwi is offline
Senior Member
 
Join Date: Oct 2012
Location: Riverbank
Posts: 544
iTrader: 0 / 0%
Default



Here I have cut it back far enough not to interfere with the fire control group and have blasted the area to clean and strip for welding
Reply With Quote
  #40  
Old 06-05-2013, 7:03 AM
Kiwi's Avatar
Kiwi Kiwi is offline
Senior Member
 
Join Date: Oct 2012
Location: Riverbank
Posts: 544
iTrader: 0 / 0%
Default



Its a tight squeeze in there so I used the TIG to melt the screw and wall of the lower together then I did a quick clean up with a dremel.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



All times are GMT -8. The time now is 3:39 AM.




Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Proudly hosted by GeoVario the Premier 2A host.
Calguns.net, the 'Calguns' name and all associated variants and logos are ® Trademark and © Copyright 2002-2016, Calguns.net an Incorporated Company All Rights Reserved.