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In my experience building AR15's in the Soviet cartridge, it is best if they have the proper feed ramp. M4 feed ramps combined with the taper of the round can cause fail to feeds. If your upper has a ramp like this you should be good. Not all have issues, but if yours does, you'll know.
Considering how many companies are now making upper receivers in 7.62x39 I'd like to believe that the feeding issues have been sorted out. My rifle came with a lifetime warranty, one of the reasons why I did not just buy an upper and bcg. I did do some research before buying and I am aware of the issues with feeding when these rifles were introduced. I guess I will find out on Thursday
So far I disassembled and lubed the rifle, the fit is excellent. The upper and lower fit as tightly as my other 2 ARs.
Here is a daylight picture, the fit and finish looks good:
Ready for the range on Thursday:
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