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Old 04-15-2019, 08:57 PM   #1
Pheenix11
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Default AK101 and Beryl differences from SLR106

I remember reading somewhere that Arsenal couldnít copy the AK101 when making the SLR106 because Russia would sue them so instead they based it on an AKM design rather than an AK-74. Iíve read that this led to some issues with the wider bolt stem clearing the mag lips and the geometry for feeding being steeper on the SLR106.

So for AK101ís, Saiga 223ís and Beryls is the receiver slightly longer or is the barrel not pushed in as far? What is different about them that allows for better feeding?
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Old 04-16-2019, 01:34 AM   #2
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Dont tell the guys in the master race or 5.56 AK threads that an arsenal 106 might have troubles feeding...
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Old 04-16-2019, 02:23 AM   #3
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I remember reading somewhere that Arsenal couldn’t copy the AK101 when making the SLR106 because Russia would sue them so instead they based it on an AKM design rather than an AK-74. I’ve read that this led to some issues with the wider bolt stem clearing the mag lips and the geometry for feeding being steeper on the SLR106.

So for AK101’s, Saiga 223’s and Beryls is the receiver slightly longer or is the barrel not pushed in as far? What is different about them that allows for better feeding?
Bulgaria developed 5.56 milled receiver AK in 1995.

Bulgaria developed a stamped receiver 5.56 AK74 around 2004.concrete floor

Russia sued Bulgaria for license fees that were greater than the company was worth.

Officially Bulgaria quit making stamped receiver AK's.

The 5.56 AK74 was designed as a stamped receiver model.

The SLR-106 is a semi-auto that uses many milled receiver parts from the still in production milled receiver 5.56 AK along with a receiver that is contracted out to another Bulgarian firearms company.

Neither one have anything to do with the Russian AK-101.

Bulgaria still makes military milled receiver AK's, but no longer makes military stamped receiver AK's.

The SLR-106 just uses a lot of milled receiver parts and has nothing to do with the AKM.

The Beryl was developed and tested for years before the Polish military would accept it and is likely one of the most reliable 5.56 AK's for that reason.

The receivers are the same length.

The way the SLR-106 is imported, it can not use a military magazine.

It might be possible to import it as a handgun and convert it to a rifle.

The other issue is the assembly process is not the regular AK factory assembly due to the receiver production.

When they get assembled the selector stop plate in the trigger guard doesn't get machined as it should.

Replace the selector stop plate and trigger guard and the Bulgarian magazines feed alright.

The AK receiver is long enough and the bolt has enough travel to feed 308 Winchester.
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Last edited by allesennogwat; 04-16-2019 at 02:34 AM.
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Old 04-17-2019, 12:37 AM   #4
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Bulgaria developed 5.56 milled receiver AK in 1995.

Bulgaria developed a stamped receiver 5.56 AK74 around 2004.concrete floor

Russia sued Bulgaria for license fees that were greater than the company was worth.

Officially Bulgaria quit making stamped receiver AK's.

The 5.56 AK74 was designed as a stamped receiver model.

The SLR-106 is a semi-auto that uses many milled receiver parts from the still in production milled receiver 5.56 AK along with a receiver that is contracted out to another Bulgarian firearms company.

Neither one have anything to do with the Russian AK-101.

Bulgaria still makes military milled receiver AK's, but no longer makes military stamped receiver AK's.

The SLR-106 just uses a lot of milled receiver parts and has nothing to do with the AKM.

The Beryl was developed and tested for years before the Polish military would accept it and is likely one of the most reliable 5.56 AK's for that reason.

The receivers are the same length.

The way the SLR-106 is imported, it can not use a military magazine.

It might be possible to import it as a handgun and convert it to a rifle.

The other issue is the assembly process is not the regular AK factory assembly due to the receiver production.

When they get assembled the selector stop plate in the trigger guard doesn't get machined as it should.

Replace the selector stop plate and trigger guard and the Bulgarian magazines feed alright.

The AK receiver is long enough and the bolt has enough travel to feed 308 Winchester.
So of all the 5.56 AKís would you consider the Beryl and AK-101 superior in design to the SLR-106?

What about builds using Bulgarian AK74 kits? If done by a competent builder are they good to go as well?
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Old 04-17-2019, 07:52 AM   #5
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So of all the 5.56 AK’s would you consider the Beryl and AK-101 superior in design to the SLR-106?

What about builds using Bulgarian AK74 kits? If done by a competent builder are they good to go as well?
The AK74 conversions are surprisingly reliable.

The bullet guide is completely different, but due to the magazine design, seems to work well for 5.56.

Some people scallop the bullet guide on each side of the rear above the magazine, but I would avoid this mod, unless needed to keep the tips of the bullets from catching under it.

Normally they should just feed above it and not catch below it, but some receivers or trunnions may have slightly varying dimensions.

The firing pin protrusion can be reduced to Galil specs, which are similar to M16 specs.

Maybe try this with a spare firing pin.

Not really any real AK-101's in the US.

The 5.45 Saiga uses a 5.45 receiver, but the 223 Saiga uses a 7.62x39 receiver shell, instead of the 5.56 one.

The 223 Saiga barrel is usually different from the AK-101 in both rifling and chamber dimensions, but some may have AK-101 barrels.

The 223 Saiga has a spring loaded firing pin, where the AK-101 does not.

The early 223 Saiga bolts had slightly longer stems, but newer ones have standard AK74 length bolts.

The 223 Saiga bolt face a raised center, which kind of ruins cases for reloading.

The 223 Vepr bolt has a plain bolt face.


The AK-101 and AK-102 use the AK74M rear sight base, but the 223 Saiga got a unique one on the original 20.5 inch barrel and this one usually shows up on the 223 Saiga 16 inch barrel too.

Some 223 Saiga's have AK-101 gas ports, while a very few have larger gas ports for lower pressure ammunition.

It is amazing how many different types of 5.56 AK magazines can work in the 223 Saiga, so they are very reliable.

The Bulgarian magazine is similar to the Russian magazine.

The Beryl seems to have benefited from the most research and testing, and the strict requirements of the Polish military.

The SLR-106 works fine with the correct ammunition, magazine, selector stop plate and trigger guard / magazine catch lever.
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Old 04-17-2019, 11:05 AM   #6
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You are a wealth of information allesennogwat, thank you!
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Old 04-17-2019, 07:35 PM   #7
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You are a wealth of information allesennogwat, thank you!
Yup. He and Mishaco FTW!
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