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Posted: 2/11/2006 3:29:56 AM EDT
| So what techniques can I use to ensure that my front sight/gas block (PRI flip up front sight/gas block and the YHM flip up front sight/gas block) is sitting TDC? I would think that I would have to be absolutely dead on so that the front sight will line up correctly with the rear and not cause a windage problem (not to mention the gas port alignment). TIA! |
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Using a plastic mag well holder install the entire rifle in a vise. With a small level check that the carry handle or the flat top of the receiver are level. Really does not matter if it is exactly level. You just need to establish the receiver bubble level position. Then using the same level on the top of the PRI check that the level is in the same position as when on the receiver. If it is in the same position you should be good to go. Charles the Gunsmith.  ETA: Where in AZ are you? I am in Tucson.
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7.62, I do mine a little differently, but it has always worked very well, and its nice and easy. I use a BUIS and attach it to the back of the upper receiver in the farther back position. Next, I use a cut carry handle, BUIS, or even a full carry handle if needed, and place it farthest out on the upper receiver. Make sure the aperature is centered, and on the smallest peep. When you look through them, you will quickly be able to tell if you are centered or not. This is the easiest way I've found (for me). |
| Install the rear sight and the front sight. Turn the whole rifle upside down and place it on a level surface. See if all four ears, two on the front sight and two on the rear, are all making contact at the same time. If you have four point contact your rile is steady. If you have three point contact is will rock back and forth, the more it rock the further you are off. If your FSB is secured with set screws, loosen them, keeping your rear sight in contact with the surface, gently move your front sight until both ears make contact, then tighten it. This is a quick field expedient method. Of course you have to find a flat surface. |
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