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Old 09-04-2021, 05:04 PM   #1
Hood886
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Default Semi SG43

The SG43 has been one of the most affordable belt fed parts kits for a while. Unfortunately the kits have really started to dry up. I know there are a bunch out there that have not been built. Building a SG43 has always been a difficult task. In the past there have always been 2 methods.

1. Using a trigger box that stuck off the side of the receiver where an external hammer and trigger could be housed. There just isn't much room inside the receiver. These always had issues as most used AR hammers and didn't have enough force to light 54r primers reliably.

2. Extend the receiver and make it striker fire. Malcolmar/wiselite did this I believe. This seemed to work better but didn't look original and added a decent bit of length to the receiver and still was not the most reliable system.

A newer method was invented earlier this year by Sundance @ weapons guild.com and some production parts were made that included a new piston/mainspring, a striker and sear body. This system allowed for the original receiver to be maintained and for very good reliability.

Basically how these builds work,
1.Receiver denials,
2.Bolt and carrier modifications
3.Rewelding receivers
4.Modifications to spade grips
5.Headspace/ weld halves together
6.Tune and test fire.

I don't have pictures of all these steps but can add them if desired.





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Last edited by Hood886; 09-04-2021 at 05:29 PM.
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Old 09-04-2021, 05:14 PM   #2
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1. The receiver needs two main things done to it. A retainer plate needs to be installed in the front of the receiver so a space is milled out for that. Second is the actual denial where you milk out a several inch section and weld in a hardened bar to prevent a full auto carrier from being installed. Basically this prevents any carrier other than the one fit to your gun from being installed.

2. The bolt and carrier get a couple modifications. The carriers cam track for the bolt is milled down so it no longer can strike where the firing pin is at. The firing pin is also replaced with a full length firing pin and the firing pin hole is opened up to allow room for a spring to prevent slam firing. The bottom of the carrier has a catch on it for the original sear, this is welded up. The piston is changed out to the replacement piston. A slot is milled into the carrier that aligns with the bar welded into the receiver to allow free movement inside the receiver.

3. The receiver is cut into 4 chuncks. These are some pretty decent gaps. I take a bar of aluminum milled down to the correct size and use that as backing and Tig weld these back together at the correct dimensions. I won't go into detail about this unless desired but could talk about this step for hours. I weld the front sections then the 2 back sections together. This leaves me with two halves.





4. The spade grips get modified for the new semi parts and new pin holes. Nothing interesting here just replacing parts and drilling holes in precise locations. A few minor modifications to the grips to prevent full auto grips ect ect.

https://i.imgur.com/6wChrX6.gifv
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Last edited by Hood886; 09-04-2021 at 05:35 PM.
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Old 09-04-2021, 05:22 PM   #3
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5.
Time for headspace. You'll find many people doing this differently. The SG43s bolt locks into a locking surface by camming to the side. Basically cams 15 degrees over or so and locks in. You need to weld these sections together at the correct distance and gap to allow for a proper headspace. Once welded your only options to fix headspace is to either modify the bolt or locking surface or cut it back and weld again. None are easy options. I like to insert the bolt and carrier and have it lock up tight on a no go gauge. I'll get everything tack welded and in place the. Remove the bolt and carrier and finish welding. This allows the receiver to shrink as the weld cools and the headspace will tighten and be good to close on a go but not a no go.

6. At this point there's a few little modifications to make but the main work is done. It's just fitting and tuning all the parts together and making sure there isn't any drag on the system. This one was set on gas port one and was still able to pull the 250 Rd belt around like it was nothing.

https://i.imgur.com/T9htvQB.gifv
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Last edited by Hood886; 09-04-2021 at 05:36 PM.
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Old 09-04-2021, 05:50 PM   #4
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Old 09-04-2021, 07:10 PM   #5
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nice
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Old 09-05-2021, 02:14 AM   #6
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Wow, that is beautiful.
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