Armory Sponsor
Posted: 1/21/2004 5:00:56 PM EDT
|
My point of impact walks up the target 3-4" at 100 yards as the barrel warms. Is there anything I can do to reduce this on a rifle that is stock design and new barrel? What about handguard fit? Is tighter better? looser? |
|
Pressure on the hand guard is causing the problem, and as the barrel heats up, you’re flexing the barrel more. Since the standard hand guard is attached to the barrel, the options are to either change out to a floating hand guard, which will solve the problem (still will get barrel whip as the barrel heats up), Or change out to a larger barrel that will heat up slower, and offer greater resistance from hand guard pressure input to the barrel. |
|
My experience has been wierd. I first noticed the walking poi problem and disassembled the gunsmith prepped rifle only to learn the barrel was totally loose. I shimmed the barrel with a washer and reinstalled. Still had same problem. Got new expensive barrel which went on tight without shim. Still same poi shift. If handguards are the problem they should be able to be modified to reduce the effect. I have been steadily reducing the tightness of their fit to no help. I will try a new set of unmodified handguards that fit real tight next. |
"Pressure on the hand guard is causing the accuracy problem".....hmmmm i keep hearing this over and over, i'm like WTH, what are these guys talking about? handguards attached to the barrel?...do FALs up there look like this one? If so, that argument is completly nonsense, first off, handguard on these kind of FALs are not attached to the barrel but they are attached to the front sight tower by a screw, that said, how could the tightness of that screw affect accuracy? PS: dont mind that junk in the Flash hider, i had just gotten back from the range. HUNTER. |
|
I'm new here, but having just acquired a FAL I figgured I'd stop by and check out the scene. Maybe I can clear this up:
The barrel on the FAL isn't free-floated in the sense that that barrel is subjected to outside forces by the stock. Since the stock connects to the front sight tower, and that tower is connected to the barrel any pressure on the stock is applied to the barrel. In the case of my AR, for example, the barrel is free-floated in that the handguard only attaches to the front of the upper and nowhere else so any force on the handguard is not imparted on the barrel. |
Well sure it does, the rifle is a bunch of gun parts together, of course, all parts on a rifle ''''connect'''' to each other. That doesn't mean anything, specially by the way that screw is screwed and where. When you tighten that screw you are tightening against the handguard which is 'mounted' agaisnt the front sight tower, a piece of metal that is sure, is mounted on the barrel......i just dont see how tightening a screw thru a hole in it could affect accuracy.
hmmm, i'm still not quite following your point here, what do you mean? HUNTER. |
|
Barrel stresses receiver stresses each can affect poi as temp changes I think My next step is to apply the new handguard which is very tight at both ends hoping that net forces on the barrel won't change as much as temperature changes. Other parts connected to the barrel should not have as much effect. The gas assembly should not have as much impact as it is meant to move freely for function. |
|
RE: Fluke's reply DSA's reply was like Fluke's. They said try another magazine as the bullets are likely getting bent or scraped as they feed. Single loading will help eliminate magazine pressure issues. I have to admit I should be single loading to test the accuracy of my new barrel but I have been spoiled shooting a very high quality rifles(AR10 and AR15 kick butt out of the box). In the end I do intend to measure the accuracy of the rifle using a full magazine. Even if only five rounds are fired. |
It means that the stocks ultimately interfere with the barrel harmonics. Free floating allows the barrel to twist and flex as it wants to and does when the bullet is propelled down it without any outside forces getting in the way. After the barrel has stopped moving it returns to a position that ideally is the same place it was before the last round fired, however, any force imparted on the barrel, such as from pressure on the stock, can prevent this from occouring. Clear as mud? :) |
Armory Sponsor