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Posted: 8/14/2010 2:04:34 AM EDT
| My Chinese PSO is slightly Canted on my PSL54C Anyone know if this is normal. Its the whole scope and base about 10 to 5 degreees to the left. If it doesnt matter Im not worried but I think it will cause accuracy problems. |
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@ lafmedic1 ––
A canted scope will result in decreased accuracy at any range other than exactly that at which you sighted-in, and, the greater the difference in the range, longer or shorter, the greater will be the difference between POA and POI. If it's canted to the left, you could judiciously file the outer face of the upper mount rail on the receiver, a little at a time, until you get it to where it gives you a level scope. Conversely, and much better, although more difficult, you could, very carefully, use a small triangular file on the inner surface of the lower rail (between it and the receiver surface). If you have qualms about filing the rail, you could make a shim to fit between the lower, inner surface of the scope/mount assembly and the outer surface of the lower rail on the receiver. The easiest way to get an assortment of good steel shims that are long enough to span the length of the rail would be to go to a Sears or to an auto-parts store and buy a set of the size feeler-gauges usually used for adjusting engine valves ( ~ 4" long ). Obviously, you'd have to experiment with shim thickness to get it right, and it would be an annoyance whenever you wanted to dismount and re-mount the scope assembly. I suppose you could use a strong, thin adhesive, like a cyanoacrylate "super-glue", to attach the shim to the scope/mount ass'y., but even that would add a few thousandths to your shim thickness. The shim approach does have the advantage of being reversible, while the filing approach is, obviously, not. Personally, I'd pick the shim approach. You could also e-mail one of the true mavens, e.g.: Zukhov, Molon, Polythenpam, etc., for advice, if they don't see this and chime in. Best of luck. Pat |
| Best reply I have gotten in a while THanks . THe scope that came with my PSL had a washer loose in it(My stupid self took it apart and managed to fix it but got crap on the lense). I managed to have the Chinese PSO that was given to me as a battlefield pick up recently. It came off either an Iraqi Dragnov( The domestic one) or an Iranian SVD. I have read that the rail sizes are slightly different from a PSL to a Dragnov and I think this is the problem. I had to adjust the nut to get it on the rail. I will try your method of shimming as I dont want to file unless I need to. Again thanks. |
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@ lafmedic1 ––
You're welcome. We former "Peckercheckers" have to stick together. (That was the the affectionately insulting sobriquet in my day, at least from fellow Squids & the Jarheads. I've heard that the current mildly derisive euphemism is "Dicksmiths".) "Hey Doc, I got this 'bump'.....". Seriously, there are better informed folks than I on this site. It couldn't hurt to PM or e-mail Zukhov, Molon or Polythenpam, or one of the other experts for their input. I used a shim on my PSL-54C, but there might be a "fix" that I'm not aware of. Pat |
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Quoted:
My Chinese PSO is slightly Canted on my PSL54C Anyone know if this is normal. Its the whole scope and base about 10 to 5 degreees to the left. If it doesnt matter Im not worried but I think it will cause accuracy problems. I can't speak for the Chinese variants, but the Romanian scopes are notorious for having canted crosshairs. These things are over twenty years old and are all military surplus, so god knows what kind of abuse these things have seen. It's very easy to fix, BUT it'll void any semblance of warrantee you may have, so if you don't care, read on... On the rear half of the scope, on the main body, you'll see three tiny dimples spaced more or less equally along the edges. These are locking screws that keep the rear lens tube on which have been painted over at the factory. Use jewelers' tools to unscrew these (put these in a dish because these screws WANT to get lost), and the rear lens tube will unscrew counterclockwise. The thing has been screwed in for decades so you may need one of those strap wrenches to remove it. When you remove it, look inside, and you'll see a square lens assembly held in the center of the tube by three posts, and attached by three screws. Take a close look at the screws and you'll see they're screwed into in semicircular slots. Once these three screws are loosened (do NOT unscrew them all the way or else the lens assembly will fall off) you can rotate the lens assembly by sliding the screws along these slots a tiny bit clockwise and counterclockwise to adjust the crosshair cant. Now comes the part that sucks- you'll need to repetitively adjust the cant of lens assembly, retighten the screws, screw the lens tube back on, and check the cant by eye to see if the crosshairs are aligned properly. You'll notice that moving them even a microbe will throw the cant off a mile, so there's no real way to adjust them other by sight. Remember that the scope is meant to be used along with the iron sights, so switching from the iron sights and back will tell you what the proper cant should be. Have you ever heard of, "nitrogen purged"? This is a fancy way of saying someone put nitrogen into the scope to push the moisture bearing air out. Get a can of wine saver from your local package store, which uses inert gasses to do literally the same thing to preserve opened bottles of wine, and it comes with a long straw. Put the straw into the scope along the side of the scope body (do NOT aim it at the lens assembly or else you'll leave residue on the lens), give it a few squirts, and then close the tube quickly. Put the microscopic screws back in, and you're in business. Hope this helps! FYI I have a Russian Kalinka Optics scope on my Romanian PSL. It's pretty snug but the PSL and Dragunov scopes are compatable. |
| Yea. I already voided the warranty on it to clean the lense so I may just buy another scope. im worried though because both my scopes are off lever by a few degrees. I wont shoot over 300 anytime soon so its no big. I will probably try the shims as stated. Again thanks for the help. And BTW those jewler screws I dont get I guess they made them out of metal shavings from a Ukranian Submarine. |
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Quoted:
Yea. I already voided the warranty on it to clean the lense so I may just buy another scope. im worried though because both my scopes are off lever by a few degrees. I wont shoot over 300 anytime soon so its no big. I will probably try the shims as stated. Again thanks for the help. And BTW those jewler screws I dont get I guess they made them out of metal shavings from a Ukranian Submarine. Keep in mind that regardless of what kind of scope you get, the PSL was never meant to be an Olympic target rifle. It was meant to be a mankiller on a battlefield, where a wound shot was just as good as a kill shot. So, in any zombie war you won't be able to pick which of the zombie's eyes to shoot out, but you will be able to hit it in the head, which is still sufficient for most zombie kills. ...unless it's a zombie Tyrannosaurus Rex, in which case you're pretty well screwed. |
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