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When I removed the handguard from my Springfield M1A (2008 manufacture), I discovered that the front band was literally rattling around on the barrel. I've already ordered some gas cylinder shims and have researched that process.
However, I also noticed that the stock ferrule doesn't put any pressure on the front band when the action is mounted and locked in with the trigger assembly. This is a new Springfield Armory "synthetic" stock (read "plastic"). Since trigger assembly lock-up is pretty loose too, I experimented with a couple of shims on either side of the receiver and forward of the pivot point created when the trigger group is locked in. Even with a double-thickness of aluminum flashing, the front band can still move a little bit.
BTW the shims did make the lock-up tighter - it feels right with them in there. It was always easy, but has gotten even looser over time.
So am I correct in thinking that lack of downward pressure on the front band is going to make the rifle less accurate?
How do you determine that you have the "right" amount of pressure on the front band?
Last but not least, did I put the shims in the right place for this purpose? There's virtually no wiggle room side-to-side for the receiver in the stock. That made me think that shims under and around the "legs" on the receiver wouldn't make sense in this situation.
BTW - I realize that shimming the gas cylinder may re-position the front band so that it does apply a slight amount of pressure on the stock ferrule.
Thanks in advance for any help you can offer.
However, I also noticed that the stock ferrule doesn't put any pressure on the front band when the action is mounted and locked in with the trigger assembly. This is a new Springfield Armory "synthetic" stock (read "plastic"). Since trigger assembly lock-up is pretty loose too, I experimented with a couple of shims on either side of the receiver and forward of the pivot point created when the trigger group is locked in. Even with a double-thickness of aluminum flashing, the front band can still move a little bit.
BTW the shims did make the lock-up tighter - it feels right with them in there. It was always easy, but has gotten even looser over time.
So am I correct in thinking that lack of downward pressure on the front band is going to make the rifle less accurate?
How do you determine that you have the "right" amount of pressure on the front band?
Last but not least, did I put the shims in the right place for this purpose? There's virtually no wiggle room side-to-side for the receiver in the stock. That made me think that shims under and around the "legs" on the receiver wouldn't make sense in this situation.
BTW - I realize that shimming the gas cylinder may re-position the front band so that it does apply a slight amount of pressure on the stock ferrule.
Thanks in advance for any help you can offer.