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Posted: 9/5/2025 9:31:00 AM EDT
| So how important is the the tab thickness on the op rod? I see specs listed as about .095 - .1, but then I see them for sale with a thickness of like .085. I ask because mine measures .091-ish. Wondering if it's causing issues or could. |
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Originally Posted By TOTHEMAX: Are you currently experiencing issues? Tabs that are out of spec can jump out of the rail, causing malfunctions. Maybe? Out of 7 clips 2 didn't have a failure to feed. Thought it might be the tension on the clips. But decided to measure some suff and noticed the tab was a little thin. It does flex out some but doesn't come off. I've read a bent rod can cause issues and was thinking it being loose might act like one being bent. |
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Originally Posted By CPT_CAVEMAN: Maybe? Out of 7 clips 2 didn't have a failure to feed. Thought it might be the tension on the clips. But decided to measure some suff and noticed the tab was a little thin. It does flex out some but doesn't come off. I've read a bent rod can cause issues and was thinking it being loose might act like one being bent. Originally Posted By CPT_CAVEMAN: Originally Posted By TOTHEMAX: Are you currently experiencing issues? Tabs that are out of spec can jump out of the rail, causing malfunctions. Maybe? Out of 7 clips 2 didn't have a failure to feed. Thought it might be the tension on the clips. But decided to measure some suff and noticed the tab was a little thin. It does flex out some but doesn't come off. I've read a bent rod can cause issues and was thinking it being loose might act like one being bent. Does this happen with USGI clips? Have you tried other clips? How about other ammo? Is the gun well lubricated? Does it have a new op rod spring? How does the tab at the end of the op rod (that inserts into the gas block) measure? Did you measure the gas block bore? Start with the simple stuff. |
3-7-77
Proud Member of the Leather Head Mafia
“In my opinion, the M1 Rifle is the greatest battle implement ever devised” - George S. Patton
Proud Member of the Leather Head Mafia
“In my opinion, the M1 Rifle is the greatest battle implement ever devised” - George S. Patton
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Originally Posted By TOTHEMAX: Does this happen with USGI clips? Have you tried other clips? How about other ammo? Is the gun well lubricated? Does it have a new op rod spring? How does the tab at the end of the op rod (that inserts into the gas block) measure? Did you measure the gas block bore? Start with the simple stuff. Thems are a lot of questions. I just bought a new oprod( looks to be new old stock). 0 movement now, but had to sand down under the barrel for it to clear. If still have issues I'll check out some of the stuff you asked about. |
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Originally Posted By HurstXJ: Sand down under the barrel? Ya, I don't know if CMPs new barrels are larger than normal or something, but the op rod rubbed on it so hard you could barely pull it all the way back. I guess it's possible how the gas piston was welded in it causes it to sit higher. Neither the CMP or the new one I bought has a piston that is dead center. |
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Originally Posted By svt40: Might want to start super simple with a tilt test. Non USGI clips have been problematic. Usually the finish is too thick and causing binding. Hit them with some scotch brite or toss them in a tumbler for a while. Possible that's it. Most of the ones I shot were AEC commercial. I threw them and some USGI I bought in a tumbler and spread the lips open some to remove tension. Now it's cooling off I should have a little more time to shoot |
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Originally Posted By CPT_CAVEMAN: Ya, I don't know if CMPs new barrels are larger than normal or something, but the op rod rubbed on it so hard you could barely pull it all the way back. I guess it's possible how the gas piston was welded in it causes it to sit higher. Neither the CMP or the new one I bought has a piston that is dead center. Op rods have bends by design but can also get bent in ways they shouldn't. If the rod bound up as you describe, sounds like it would have been worth sending to Columbus Machine to be gaged and adjusted to specs unless something else is going on like an over or under indexed barrel. |
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Originally Posted By TOTHEMAX: Does this happen with USGI clips? Have you tried other clips? How about other ammo? Is the gun well lubricated? Does it have a new op rod spring? How does the tab at the end of the op rod (that inserts into the gas block) measure? Did you measure the gas block bore? Start with the simple stuff. Was able to find time to shoot yesterday and I think the new op rod helped, but didn't fix the issue. with USGI and my other clips it would fail to feed after the fist shot then run fine. I upped my powder charge on my reloads(Match Rifle/2520). Is there a load I should try to rule that out? It has grease on it, but I didn't slather it in it. I use about as much on my M1A . How much does it actually need? I replaced the op rod spring with a new one. Gas piston measures .526 Have no idea what the Cylinder measures. Is there a way to check without buying a tool? |
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Originally Posted By CPT_CAVEMAN: Was able to find time to shoot yesterday and I think the new op rod helped, but didn't fix the issue. with USGI and my other clips it would fail to feed after the fist shot then run fine. I upped my powder charge on my reloads(Match Rifle/2520). Is there a load I should try to rule that out? It has grease on it, but I didn't slather it in it. I use about as much on my M1A . How much does it actually need? I replaced the op rod spring with a new one. Gas piston measures .526 Have no idea what the Cylinder measures. Is there a way to check without buying a tool? Originally Posted By CPT_CAVEMAN: Originally Posted By TOTHEMAX: Does this happen with USGI clips? Have you tried other clips? How about other ammo? Is the gun well lubricated? Does it have a new op rod spring? How does the tab at the end of the op rod (that inserts into the gas block) measure? Did you measure the gas block bore? Start with the simple stuff. Was able to find time to shoot yesterday and I think the new op rod helped, but didn't fix the issue. with USGI and my other clips it would fail to feed after the fist shot then run fine. I upped my powder charge on my reloads(Match Rifle/2520). Is there a load I should try to rule that out? It has grease on it, but I didn't slather it in it. I use about as much on my M1A . How much does it actually need? I replaced the op rod spring with a new one. Gas piston measures .526 Have no idea what the Cylinder measures. Is there a way to check without buying a tool? First thing to do is use factory ammo. Piston tab looks good. I grease up the gun in any spot where metal contacts metal. There are numerous videos online about lubrication. You can buy pin gauges to measure the gas cylinder : https://www.garandgear.com/product/m1-garand-gage-pins/ |
3-7-77
Proud Member of the Leather Head Mafia
“In my opinion, the M1 Rifle is the greatest battle implement ever devised” - George S. Patton
Proud Member of the Leather Head Mafia
“In my opinion, the M1 Rifle is the greatest battle implement ever devised” - George S. Patton
|
Originally Posted By CPT_CAVEMAN: Maybe? Out of 7 clips 2 didn't have a failure to feed. Thought it might be the tension on the clips. But decided to measure some suff and noticed the tab was a little thin. It does flex out some but doesn't come off. I've read a bent rod can cause issues and was thinking it being loose might act like one being bent. Originally Posted By CPT_CAVEMAN: Originally Posted By TOTHEMAX: Are you currently experiencing issues? Tabs that are out of spec can jump out of the rail, causing malfunctions. Maybe? Out of 7 clips 2 didn't have a failure to feed. Thought it might be the tension on the clips. But decided to measure some suff and noticed the tab was a little thin. It does flex out some but doesn't come off. I've read a bent rod can cause issues and was thinking it being loose might act like one being bent. Huh? ….. The op rod was pre-bent at the factory. Don’t try to straighten it or dremel it. |
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Originally Posted By CPT_CAVEMAN: So pretty sure I got it worked out. Replaced the follower arm, ejection spring(was bad for sure), and cleaned a bunch of junk from under the clip latch. Shot 2 clips with 0 issues(first time that's happened) 2 clips? 2 could be a false positive. Try shooting 8 clips of HXP or GI L.C. surplus. Then get back to us. If it runs hiccup-free for 64+ rounds, you’re good to go. Be sure to start with a clean, properly greased rifle. |
| To my way of thinking as long as the op rod doesn’t jump the groove its within spec. |
ProTip: Never pick a fight with a tree planter. He swings a hoedad for 9 hours a day, carries 30-40 pounds of seedlings on his back, and has 12-14 friends just like him hiding out on the other side of the junk butt pile. They will fuck your shit up.
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Originally Posted By Nick_Adams: [/b] 2 clips? 2 could be a false positive. Try shooting 8 clips of HXP or GI L.C. surplus. Then get back to us. If it runs hiccup-free for 64+ rounds, you’re good to go. Be sure to start with a clean, properly greased rifle. Very true. I'll shoot another 3 I have loaded up just to make sure, that will be 5 total. Then I'll probably throw it in the safe and hardly shoot it  My original arm looks like this unmodified one, I'm pretty sure that's why it was binding after the first shot. I didn't run across this until after. https://ammogarand.com/m1-garand-follower-ar1.html |
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