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Posted: 4/8/2013 12:34:47 PM EDT
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I recently got a PSA 10.5 complete upper for a mk18 build and noticed an issue after I installed the LMT rear sight. The sight base appears to not sit flush on the upper rail leaving a ledge on the left side and an over hang on the right. The sight fits perfect on my other uppers.
PSA Upper: http://i47.tinypic.com/2508a6d.jpg http://i46.tinypic.com/2jbtq9v.jpg http://i48.tinypic.com/hvpkcy.jpg S&W Upper http://i46.tinypic.com/t529as.jpg I emailed PSA last monday and havent heard back yet so I figured I would see what you guys think. Is this something common or is my upper out of spec? |
| im probably seeing it,,,. the place you marked how the rear site doesnt sit flush with the top of the upper receiver? i dont think it could ever be exactly flush unless you milled the sight and upper at the same time? it might look worse in person but from those pics... youll never get perfectly flush.. |
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If the site lines up without a ton of adjustment I wouldn't worry about it. Lines up with what? Its essentially crooked on the receiver rail. What I mean is...Do the sites shoot straight without a ton of windage adjustment? It doesnt look out of spec, thats pretty damn close. Carry handles dont always fit exactly perfectly either. |
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does it matter if theres a ton of windage adjustment? as long as it can be zeroed then its good to go right? Well, if you are maxed out on windage just to get it zeroed, something is wrong, and if you actually need it for windage, you wont be able to adjust it. |
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Quoted:
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does it matter if theres a ton of windage adjustment? as long as it can be zeroed then its good to go right? Well, if you are maxed out on windage just to get it zeroed, something is wrong, and if you actually need it for windage, you wont be able to adjust it. I think it will zero due to the large windage adjustments bit it looks retarded as hell since it mounts crooked. Palmetto State said it doesnt matter as long as it zeros  ....Of course it fits on my other 3 uppers perfectly and they don't find this to be abnormal at all. Go figure
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Update:
So I got the digital caliper out and measured the width of the receiver rail where the rear sight is mounted. PSA upper #1: 0.645 in S&W upper: 0.639 in PSA upper #2: 0.639 in PSA upper #3: 0.639 in LMT sight: 0.638 All 4 uppers have the same splintered A forging mark and PSA upper #1 and PSA upper #3 were bought at the same time yet there is a difference in there rail width..... Does anyone know if this is a common variation? |
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