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105 look alike

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I know this has been done before


My question is: the 105 is a 5.45 x 39 correct


My russian 105 gas block is marked 7.62 x 39?


Do I use the 7.62 x 39 on a 5.45?

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I believe the 7,62x39 mark makes it a 104 fsgb. I have it on my Draco:




Not exactly sure if you can use it on a 5.45 though. I guess that would depend on barrel and gas port size. Im sure you being you can make it work or make a part to make it work, like if the barrel is too small, put a sleeve on it, which is what was done on the draco. you might also be able to taper the sleeve gas vent to meet up with the 104/105 fsgb vent hole.


Also, did you get the 105 fsgb from rusmilitary?

Edited by AZG

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Yep that looks like a russian


You are correct it has a slightly smaller ID and the ports don't line up but both are not a problem


Yes russ mill


Thanks AZG Looks like I will build a 104 look alike

Edited by RamLake
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