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The issue I had with a KA RAS was the delta ring had a different thread then the body so it wouldn't go on at all, ended up making a delta nut out of the old one already on the gun. Not to mention that when I put the nitro rail on the top it lifted the RAS 1/8 of an inch to high for the thing to tighten on, so I had to do some custom grinding on the spacer ring so it could lift up but still attach to the body. What a pain in the a$$.
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