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#431
08-11-2021, 03:04 PM
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Great range report, sorry to hear about the AR not cycling. I’m thinking the gas block or tube is not lined up properly with the port on the barrel.
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#432
08-11-2021, 03:53 PM
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That is the first place I suspected, and where I will look. Problem being, I have to take apart a lot to get to it, and it means painstakingly putting it back. But I suppose I must.
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#434
08-12-2021, 10:53 AM
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No, it was a standard "carbine" buffer set (spring & buffer, etc.). Mid-length barrel.
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#436
08-16-2021, 09:27 AM
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Update: I think I'm starting to get the eye relief thing under control for the RPR. I will, though, have to resolve the astigmatism issue. For exmaple, when I use my right eye (which I would, normally) to sight in, and I get a good reticle picture, and I then switch to the left eye, the line of sight changes totally. It would appear to be off by the diopter of the astigmatism. So we'll see what needs to happen.
As for the AR-15, I'm thinking of getting a "dimpling jig" to help align the gas port and block....  Are these things worth it? It's only $40.00 but if it helps align the port and block, it's well worth it. Then, all I have to worry about is the tube.
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#437
08-16-2021, 11:33 PM
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It’s well worth it to be able to line up the gas block with the port. I would spend the mo why on it, then on your next build you will already have it in your arsenal.
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#438
09-07-2021, 07:31 AM
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Update: I have begun to do some practice in "Prone" in preparation for my Long Range course coming up (I moved it to 09/18). So I'm just practicing scope sighting now. I'm wearing my long distance glasses when I practice, hopefully to offset the astigmatism. Eventually, I'll probably have to get a new eye exam and get new sets of glasses. I re-aligned the gas block and barrel port on my AR-15 and will test it once again. I'm also ordering a dimple jig as well, but I have to make sure it's he right one for that block. I'll call the block's manufacturer for a recommendation. I'll post again after the class.
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#440
09-15-2021, 02:08 PM
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Update: Dimpling Jig received. I used it this afternoon and successfully dimpled the barrel. It went reasonably well. I was able to feel the dimple as I was attaching the gas block and I could verify that the one set screw (I did only one dimple... the one closest to the back end of the block) did seat a little lower than the other set screw, as described in one of my YT videos. Everything else checks out in terms of the gas path. I can blow well on the barrel port and feel good pressure out of the muzzle side. Same with the gas tube to the block (and I visually note the tube is properly aligned to the block). The only other issue that might happen now is if the tube and the gas key (on the BCG) are misaligned. I don't think so, but that is a possibility. Much easier to fix, I think, though. Another thing could be the buffer and spring but, again, I don't think so as I believe I got the carbine buffer/spring set. I'll measure the spring so we'll see (10.5" it's supposed to be). I will be taking my long range course this Saturday at JTAC. I had a little "prone practice" and think I got the proper eye relief to see the reticle in perfect shape. Now, I just have to work on the Parallax and then start zeroing in. After class, I will test the AR and see if my dimpling helped the situation. Hope so! I'll provide an "after action" report after class.
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