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Old 06-20-2018, 06:52 PM   #1
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Default Converting NDS-2 to SLR-106FR-style build with 5.56 barrel

Hi all,

Working on building up a 5.56 AK off of an NDS-2 receiver to make it like an SLR-106FR or AK-74M. I know it's easier to get an NDS-2SF receiver to build off of, but the NDS-2 receiver is what I have to work with.

What kind of sidefolder trunnion would be appropriate for an NDS-2 receiver? I am kind of confused with the entire 4.5 vs 5.5mm trunnion, and it seems like the only ones really available to get is the 4.5mm version. Is any black plastic folding stock furniture pretty much compatible with either trunnion version and will align correctly with the scope rail on the left side of the receiver?

Also, who currently offers services to make the appropriate cuts in a standard AK-74 receiver like the NDS-2 to make it into an AK-74M style with the folding cutouts and such?

Thanks all
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Old 06-20-2018, 07:02 PM   #2
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You can use 4.5 with a arsenal 4.5 poly stock. The only reason to go with 5.5 is if you're going for a more accurate--and expensive--ak74m clone with russian parts. You could use a 5.5 stock with a 4.5 rear block but you'd need to shim the hole in the 5.5 stock and possibly reduce the height of the hinge. The receiver can be cut for the latch parts/rear block, but I don't know who offers that; easy enough to DIY though. Unless you manage to get it done for free, you'd be better off picking up a morrisey aks74 receiver to use with a 4.5 trunnion, they're relatively inexpensive and are the same thing as a nodak.
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Old 06-20-2018, 07:11 PM   #3
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You can use 4.5 with a arsenal 4.5 poly stock. The only reason to go with 5.5 is if you're going for a more accurate--and expensive--ak74m clone with russian parts. You could use a 5.5 stock with a 4.5 rear block but you'd need to shim the hole in the 5.5 stock and possibly reduce the height of the hinge. The receiver can be cut for the latch parts/rear block, but I don't know who offers that; easy enough to DIY though. Unless you manage to get it done for free, you'd be better off picking up a morrisey aks74 receiver to use with a 4.5 trunnion, they're relatively inexpensive and are the same thing as a nodak.
Thanks, es.

Is it the 5.5mm trunnion that overhangs off of a 74 receiver? The 4.5mm trunnion should be flush?
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Old 06-20-2018, 07:18 PM   #4
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Thanks, es.

Is it the 5.5mm trunnion that overhangs off of a 74 receiver? The 4.5mm trunnion should be flush?
Neither one should hang over a fixed stock ak74 receiver, so if that's what you're starting with you'll be good to go. Both require a cut on the left to accommodate the hinge, and a little trim on the bottom and right of the rear to bring the receiver flush with the block. Then of course the cuts for the latching hardware, but those are made after you get the block fitting right and the lower trunnion holes drilled on both sides.
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Old 06-20-2018, 07:29 PM   #5
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I also read that the stock angle is different when folded for the 4.5mm or 5.5mm trunnion. Do you know if that matters when making sure that the stock relief cut for the scope rail will align properly while folded, or is the stock angle difference between a 4.5mm and 5.5mm trunnion only when the stock is unfolded?

It sounds like the 4.5mm trunnion is probably the way to go since I already have an Arsenal folding stock set.
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Old 06-21-2018, 10:11 PM   #6
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Ordered a 4.5mm trunnion set that includes everything including the latch set. Now time to get the receiver modified to have the cutouts needed for the folding stock....thanks for everyone's help.
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Old 06-21-2018, 10:25 PM   #7
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There are two types of 5.5mm folding trunnions: 6 degree and 4 degree. Pretty sure all Bulgarian 4.5mm and 5.5mm trunnions are 6 degree and all the Russian 5.5mm are 4 degree.

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