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Posted: 7/5/2010 4:05:37 PM EDT
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I just completed my first build (a 7 in. pistol). I ordered a complete upper with a quadrail from RRA. The problem is that the quad rail does not thread correctly. When it is screwed all the way in, the rail is a little less than an 1/8 turn from the rail on the A4 upper. If that didn't make sense, when screwed all the way in, the quad rail does not like up with the A4 rail. I tried unscrewing it until it was tight against the gas block, but it doesn't line up right there either. Is there anything I can do about this or is it a manufacturer defect or what?
Oh, when the handrail is loosened to where the rails on the handrail and A4 do much up, it is very loose. Thanks in advance. |
If your upper from RRA looks like this:
then you should have a keeper ring like in the picture to properly align the forearm. Step 1: Thread keeper ring and forearm all the way back. Step 2: If it doesn't line up properly, back the forearm off until it does either by using a carry handle across the rail or by eye. Step 3. Back the keeper ring to the forearm to keep it in place. |
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