Assembled my SLR receiver today. Overall it went well except I noticed one more thing. There was a fairly significant machining mark in the tabs for the bolt catch roll pin.
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The rear tab was gouged quite a bit. This concerned me because these tabs are a known week point. I figured that the gouge had created a line that, combined with the tight roll pin hole, was the perfect week point to possibly split along. Not a good place for something like this.
I tried tapping the roll pin in and could tell that it was going to be very tight so I stopped. This time I wasn't taking any chances. I have some longer than normal drill bits so out came the drill. Not overly thrilled but I think it was the best route to take. Pin then tapped in as it should.
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Here's the rifle built. IBI 7.62x39 barrel is going on a MS when it arrives but I couldn't wait till then to try it out.
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Final thoughts: Both products are very different from each other, both in design and execution. One was absolutely flawless and assembled without any issues. The other is functional but lacking in the attention to detail department.