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Posted: 5/12/2007 3:28:19 AM EDT
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Took my CMP Field grade Garand out to the range for the first time yesterday, shooting the Greek surplus en bloc. Started at 25 yards and got on paper and adjusted the rear sight to get to center target. Then moved to 100 yards and got on paper and further adjusted rear sight getting increasingly closer to center. Then, all of a sudden, I was completely off the paper and could not seem to get back nor figure out what was wrong. Has anyone else experienced this with an old M1? Might it have been a loose rear sight? A hot barrel? hed |
Check the sights for looseness, both front and rear. I had a similar experience once, and it was the front sight that came loose. Its held in place by an allen head screw, if it comes loose your front sight wanders around on its dovetail. I didn't even notice until I got home, took the rifle out of its case, and the front sight fell off! I just thought I was shooting really crappy until I saw that. We just love excuses like that, "It wasn't me shooting poorly, the front sight came loose "
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Exact thing happened to me. Thought I was going nuts. Loose front sight. Simple fix with allen wrench. |
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my front sight walked onme yesterday when I was shooting, but it walked then stopped..... I am thinking my set screw was not tight enough, adn from what I understand it is a common problem with these old rifles. I was told by an old guy 9which does necessarily mean he is right) that when I first sight the thing in I should use the front sight, until it is very near on target, that will leave me with the most side to side movement for my rear sight, which at the moments is pretty far to one side. Makes sense, though I doubt I am likely to be adjusting on th fly for windage |
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If it was your gas plug, your groups would open up like basketball size! BTDT. I was shooting good and things went south fast until I figured it wasn't me. Most hot barrel problems that I've experienced cause mostly vertical shifts with a little horizontal shift. Nothing drastic that will send me left or right off the paper. M1's do get hot and can definitely have a different warm barrel point of impact. Let us know what you find, like they said, check the front sight first, then make sure the rear sight works correctly and the notches work to keep the sight from moving. If it's not your sights, check your stock, see if there is contact where there shouldn't be, barrel should not touch the wood. Also check to see that your rear handguard has a gap between the wood and the receiver (about 1/16 or 1/32 of an inch). You also don't want your front handguard to be tight, you want that to have fore/aft play. If it is tight then the barrel will walk with heat!!!!! you can back off the gas cyl lock. . You can accidentally tighten the gas cyl lock too far, pinching the front handguard (or pinches when heated). Just check to make sure the gas cylinder port opening lines up with the port in the barrel. I check this with the gas plug out and inserting a allen wrench into the ports to check allignment. Pull the gas cylinder against the lock when you do this. Remember the gas plug screw draws the gas cylinder forward to the lock, not the other way around. As far as shifting on the fly; each click is 1 minute of angle or about 1 inch per 100 yards. (1"at 100, 2"at 200, 3"at 300 for one click). So if your 6 inches from the center of the black at 300 yards, you need a 2 click change. Incidentally the scribe marks on the rear sight base for windage are 4 clicks each or 4 inches at 100 yards per scribe mark. |
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