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5.56 and 7.62 have the same one on Bulgarian Krinkov's. Despite what Kvar's website says the Bulgarian Arsenal website shows there are no 5.45 ones on 5.56 Krinkov's.
 

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If you're going for the look of the original Bulgarian AKS-74U with brown wood handguards, then a conical muzzle device would be more correct than a beer can.
 

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If you're going for the look of the original Bulgarian AKS-74U with brown wood handguards, then a conical muzzle device would be more correct than a beer can.
I agree with this, The 4 piece IIRC are only made for 7.62 and used on all other calibers, that way they dont make a mistake and put a 5.56 or 5.45 on a 7.62....
 

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Bulgaria doesn't make 5.45 AK's anymore. They still have some RPK-74's left in stock but they aren't making any more. The 4-piece device is to control muzzle blast which is greater in 5.56 than 5.45. In 5.56 the 5.45 muzzle device might put too much pressure back to the gas system that close to the chamber too. The 5.56 Krinkov has always had the 4-piece device. I had complete parts kits and that is also what is included in the kits. Kvar does now list the 5.45 muzzle device as 5.45 and 5.56 but it is not correct for a 5.56 model.
 
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