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Old 07-06-2017, 11:47 PM   #1
Johnson184
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Default 7.62x39 to 5.45x39 conversion advisable?

Seems like the vast majority of transferable AKs are 7.62x39. Has anyone taken one and had it converted to 5.45x39? Is it as simple as swapping out the barrel and bolt carrier group? I'm wondering if the magwell would also have to be altered. Is this an easily reversible process?
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Old 07-07-2017, 03:23 AM   #2
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It has been done.

Often with Chinese AK's, some that were 223.

With a 7.62x39 AK the ejector would have to be built up with hardened weld or the ejector rail replaced.

The 5.45 bullet guide is different and its rivet hole location is slightly farther forward.

Often the trunnion is removed and welded and redrilled.

Sometimes the new bullet guide is just welded in place.

Some people have redrilled the trunnion rivet holes to look European with welding the old holes in the trunnion and receiver.


The magwell is oversize as is the shelf in the trunnion, those don't seem to cause problems.

Some people like to keep the serialized trunnion riveted to the receiver.

A couple of ATF letter indicate that for, "repair or service" separating the trunnion from the receiver should be acceptable.

If keeping the Chinese rivets, the bullet guide can be welded in place and the barrel turned down for the 19mm 7.62x39 Chinese trunnion.

The trunnion isn't made for the European rivets but some do something just for the look.

It might even be possible while keeping one or two rivets in place for legal concerns but the new rivets would likely be for looks only, as there isn't space machined to form the inside rivet heads.
Many 5.45 barrels are 22mm in diameter at the trunnion journal.

With a 19mm Chinese trunnion, the barrel can be turned down.

The less common 23mm trunnion transferable AK's might take a custom barrel or sleeve.

For sleeving, turn down the barrel to 19mm with a step left at the rear of the trunnion and use a thin sleeve to bring the diameter to 23mm.
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Old 07-09-2017, 08:20 AM   #3
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Why?
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Old 07-09-2017, 08:30 AM   #4
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Why?
Because there are only so many transferable AKs available.

If you want the most authentic "AK74" ( i.e. "with giggle switch" ), you have to convert an existing registered receiver.
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Old 07-09-2017, 04:35 PM   #5
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Originally Posted by nalioth View Post
Because there are only so many transferable AKs available.

If you want the most authentic "AK74" ( i.e. "with giggle switch" ), you have to convert an existing registered receiver.

Fair enough
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Old 07-10-2017, 12:25 AM   #6
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A lot of the conversion I've seen have been Krinkov conversions.

That's about the only way to have a transferable Krinkov.
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Old 07-10-2017, 02:36 AM   #7
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There is a nice full auto AKMSU that started life as a Chinese 223. (that 223 to 7.62x39 though)
I would look for 223/556 FA to convert to 5.45


AKMSU https://www.youtube.com/watch?v=NxKoKQLodOA
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Old 07-10-2017, 07:20 AM   #8
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Quote:
Originally Posted by Oak47 View Post
There is a nice full auto AKMSU that started life as a Chinese 223. (that 223 to 7.62x39 though)
I would look for 223/556 FA to convert to 5.45


AKMSU https://www.youtube.com/watch?v=NxKoKQLodOA
A lot of 223 Polytech AK's were converted to 7.62x39.

The Polytech magwell is the same size as 7.62x39.

The 223 barrels were overgassed and no magazine was 100% reliable in them in 223, especially in full auto.

The 7.62x39 ammo was likely cheaper than 223 ammo.
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Old 07-10-2017, 01:06 PM   #9
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We did a x39 conversion on a Tranny 223 Chinese AK. In the transferable world they are worth much more in x39. Its a barrel and bolt swap for that conversion. To 5.45, like they said ^^, much more work.
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Old 07-10-2017, 10:16 PM   #10
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We have done MANY!!!! over the years. Like stated above 99% were 74U conversions.
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Old 08-14-2017, 10:05 PM   #11
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Quote:
Originally Posted by allesennogwat View Post
It has been done.

Often with Chinese AK's, some that were 223.

With a 7.62x39 AK the ejector would have to be built up with hardened weld or the ejector rail replaced.

The 5.45 bullet guide is different and its rivet hole location is slightly farther forward.

Often the trunnion is removed and welded and redrilled.

Sometimes the new bullet guide is just welded in place.

Some people have redrilled the trunnion rivet holes to look European with welding the old holes in the trunnion and receiver.


The magwell is oversize as is the shelf in the trunnion, those don't seem to cause problems.

Some people like to keep the serialized trunnion riveted to the receiver.

A couple of ATF letter indicate that for, "repair or service" separating the trunnion from the receiver should be acceptable.

If keeping the Chinese rivets, the bullet guide can be welded in place and the barrel turned down for the 19mm 7.62x39 Chinese trunnion.

The trunnion isn't made for the European rivets but some do something just for the look.

It might even be possible while keeping one or two rivets in place for legal concerns but the new rivets would likely be for looks only, as there isn't space machined to form the inside rivet heads.
Many 5.45 barrels are 22mm in diameter at the trunnion journal.

With a 19mm Chinese trunnion, the barrel can be turned down.

The less common 23mm trunnion transferable AK's might take a custom barrel or sleeve.

For sleeving, turn down the barrel to 19mm with a step left at the rear of the trunnion and use a thin sleeve to bring the diameter to 23mm.
Is it easier to convert a 223 AK to 5.45 or a 7.62 AK to 5.45?
I've shot a full auto AK47 and an AK74 recently. The AK47 was obviously harder to control or even get rounds on target at even 25 yards unless I'm using 2 round bursts. An AK isn't next on my machine gun list, but I'm just curious in case I come across a great deal locally on a transferable AK.
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Old 08-14-2017, 10:06 PM   #12
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Quote:
Originally Posted by Johnson184 View Post
Is it easier to convert a 223 AK to 5.45 or a 7.62 AK to 5.45?
I've shot a full auto AK47 and an AK74 recently. The AK47 was obviously harder to control or even get rounds on target at even 25 yards unless I'm using 2 round bursts. An AK isn't next on my machine gun list, but I'm just curious in case I come across a great deal locally on a transferable AK.
If you've got the dosh for a transferable AK, the cost of conversion shouldn't be worth talking about.
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Old 08-15-2017, 11:06 AM   #13
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Quote:
Originally Posted by Johnson184 View Post
Is it easier to convert a 223 AK to 5.45 or a 7.62 AK to 5.45?
I've shot a full auto AK47 and an AK74 recently. The AK47 was obviously harder to control or even get rounds on target at even 25 yards unless I'm using 2 round bursts. An AK isn't next on my machine gun list, but I'm just curious in case I come across a great deal locally on a transferable AK.
With the Chinese AK's, 7.62 might be easier.

5.45 is used for Krinkov conversions usually.

5.45 has such a different bullet guide the rivet hole located farther forward slightly.

Welding and drilling can fix that though.

I tried a 7.62x39 bolt in a Bulgarian 223 trunnion and it didn't fit right off.

The Chinese 223 might be closer to 7.62 though.

The Norinco 84S requires the magwell opened up for 7.62 magazines.

A 5.45 magazine may fit without mods.

The 223 Polytech has a 7.62x39 magwell already.

The 223 Polytechs don't often work properly in 223 and are often converted to 7.62x39.

The 223 receiver is desirable for 5.45 only be cause of the factory ejector, but a shorter 7.62 one can be built up with weld for smaller cartridges.
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Old 08-15-2017, 07:41 PM   #14
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I had two 7.62 guns converted to an AK74M and an AK105 by Mario at POHF.

5.45 is much more controllable in FA and makes it easier to shoot all day.

Also makes suppressed FA with a .30cal can a safer proposition with the added clearance in the baffles.
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