Anyone else have an 'AR-47' lower? I have an AR lower that is called an 'AR-47'. It adapts a 7.62x39mm AR top end to a lower receiver that accepts unmodified AK-47 mags. (Special Weapons Inc, Mesa, AZ.) I use drums with mine, makes a good little sort range, .30 cal. lead waster! Closest thing to a reasonable priced .30 cal squad SEMI-automatic weapon you can get! Mine is just a joy to shoot, and reasonably accurate too! Kicks a$$ on every AK clone around here right out of the box... The problem I had with mine was gas back to the bolt. I had a full 20" barrel, but had to (lathe) turn the barrel and move the gas block back to a carbine position to get enough gas pulse to the bolt... It still uses factory type gas blocks and tubes, but having to move things was a pain! Anyone have a version that used a full 20" barrel, and got the forward gas block/system to work? What did you have to do to get it to work? Does anyone in the civilian market make an extra large diameter gas tube?