ramlake 98 Posted June 18, 2012 Report Share Posted June 18, 2012 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? Quote Link to post Share on other sites
gregomega 929 Posted June 18, 2012 Report Share Posted June 18, 2012 (edited) 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 June 18, 2012 by AZG Quote Link to post Share on other sites
ramlake 98 Posted June 18, 2012 Author Report Share Posted June 18, 2012 (edited) 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 June 18, 2012 by RamLake 1 Quote Link to post Share on other sites
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