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Posted: 4/19/2003 2:14:59 PM EDT
| last 2 times i shoot my shorty it seemed to recoil alot harder than normal, havnt changed any thing on the gun. is it time for a new recoil spring or is there something else wrong?? |
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If your spent case ejection path is at the 5:00 position, then the spring is fine. However, if the path is to the 2:00 position (due to the cases being peened off the defector and deflected forward) then you may want to look into a new recoil spring. As for your rifle, it sounds like you may have a few hundred rounds threw the rifle and the upper has final broken in. If this is not the case and the rifle has seen many thousands of rounds, then a new spring may be in order. As a note, one of the members went to the Wolf extra power recoil spring, and it has lasted a lot longer than the stock in regards to wearing out. |
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Pitting on the bolt face? If so, some pressure plasma pitting will occur, but if you’re getting a deep pitting, it may just be due to the weak spring letting the bolt unlock too fast and the pressure leaking past the primer on bolt unlock. If the pitting isn't too deep, then don't worry about it. However, if you have a deep flame cut, you may want to buy a new bolt and change it out. I'm up at the cabin right now, so I don’t have my bookmarks that are on my main computer. If you go to the start page of the ar15.com site, on the left hand side you will find the manuals for the rifle. Down load the repair manual and look for the spec on bolt face pitting to get a idea of what is in spec, and what is beyond a useful life of the bolt. P.S. I would do it for you, but currently I’m visiting on a modem connection and it would take forever. |
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No worries!!!! it's just a mark from the hammer when it cocks against the carrier ramp. The one thing you may want to keep on eye on is how deep the peening gets. The carrier should have been heat treated and hard as hell. If it seems like the metal is soft, you may want to send it back and get it replaced. |
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Quoted: If your spent case ejection path is at the 5:00 position, then the spring is fine. However, if the path is to the 2:00 position (due to the cases being peened off the defector and deflected forward) then you may want to look into a new recoil spring. You really can't go %100 with that analogy. I have a 11.5+5.5 A1 upper. When we drop an auto carrier in it and put it on a select fire M4 lower it puts 62 gr Wolf empties @5:00 and my 55 gr handload empties at around 2:00 or so. |
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Waldo, Ok, sue me!!!!!! Comparing wolf ammo to hand loads are well beyond apples and oranges. The Wolf ammo has a lacquer coat over the steel case. Due to the friction of the lacquer coat (including powderized fouling), the case has a little more surface friction. This cause the bolt to loose a little more energy as the spent case is being pulled out of the chamber. On factory ammo, including surplus SA and some military lots, the cases are a tad on the rough side. Here again, the friction on the case to sidewalls is still fairly strong. Regarding hand loads, at least when it comes to mine, the cases have be tumbled until that are bright and shiny (to the point that you can see your self in the reflection). Also, since they are loaded to the barrel, and not to max loads, when they are fired in my rifles, the case release off the chambers walls is very clean due to the slick-gliding surface of the polished case. To add to the effect, since the hand loads are less that full power, the expansion of the case to the wall is under less stress and again releases with little effort. Due to this lack of tension on the extracted case to the chamber walls (pressure and surface friction), my hand loads will allow the bolt/carrier to recoil at a greater speed, and cause the cases to be ejected/thrown out of the rifle at a greater speed. By tuning the ejector spring to the given ammo type, you can control the speed of ejection in reference to the carrier/bolt speed. The dead give away is when the rifle is running normal, with a good ejection path, then down the road, the rifle starts to recoil harder and the ejection path changes (both in path and greater ejection distances). Plus to add to the matter, with all the price competition of the suppliers, some of the recoil springs that are being offered are sub-par, and loose there set tension weight very quickly. But hey, I see that you are a fan of the Wolf 62grain ammo also. I switch over from the 55 a while back. The difference is accuracy has been night and day between the two. Granted that you won’t win any matches with the ammo, but my groups shrink from 5” down to 2”-3” going the extra 7 grains. My guess is the gun power used just works better with the heaver bullet. |
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