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Posted: 1/3/2013 6:28:13 PM EDT
| I have a Colt SBR that had some play between the upper and the lower. I just put on an o ring on the upper to see if it stop the play. Well it did. My question is, are there any negative effects that this could affect my rifle after installing this o ring? |
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I have a Colt SBR that had some play between the upper and the lower. I just put on an o ring on the upper to see if it stop the play. Well it did. My question is, are there any negative effects that this could affect my rifle after installing this o ring? There are no negative effects either way. Most AR's have wiggle. It's not designed to be a perfect lock-up between upper and lower. If the tolerances were too tight, it may prove difficult to swap uppers and lowers for replacement or upgrades. |
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OK just making sure. I actually don't mind the wiggle but wanted to try the o ring. Locks fairly well. Will there be any issue with the heat afters substantial gun fire? It's like that by design, Colt wants to be sure that all uppers and lowers are easily interchangeable for the military (as tooling wears) between number 1 and 1,000,000. I have many Colts, they all have the same amount of play in them. |
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Over time, that o-ring can start to wear out/break apart...and possibly find it's way into your fire-control group...which could cause an inability to function properly until it's removed. I'd say to leave the o-ring out of the rifle. Between the accuwedge and the oring, I think you safer with the o-ring. Although I think I have read about 2 accueadge issues in my total AR knowledge time of about 12-13 years. |
| My Colt H Bar came with an acuwedge and that's the first thing I took out. The Sig I just bought has a spring loaded pin where the acuwedge would go that accomplishes the same thing. It's nice and tight but you have to squeez the upper and lower together pretty hard to get the take down pin out without using a punch of some kind. I like to be able to push/pull the take down pin with my fingers and not have to use a bullet or pen. A little wiggle is not bad. |
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My Colt H Bar came with an acuwedge and that's the first thing I took out. The Sig I just bought has a spring loaded pin where the acuwedge would go that accomplishes the same thing. It's nice and tight but you have to squeez the upper and lower together pretty hard to get the take down pin out without using a punch of some kind. I like to be able to push/pull the take down pin with my fingers and not have to use a bullet or pen. A little wiggle is not bad. So loosen or take out the tensioning screw/spring on the Sig. Problem solved. |
| If it bugs you, spend $5.00 and get an Accu-Wedge - it won't end up in the fire control group. Accuracy is NOT improved by having a tight fitting upper lower. But some people FEEL like it's better, so if it helps your confidence, get something tight fitted. For most of us, it's a non-issue. CC |
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Its normal It's normal for Colt. Colt builds wiggle into their specs so armorer's can be guaranteed any upper fits on any lower. Other manufacturers without this requirement can build nice, tight-fitting U/Ls. I love it. If it wiggles it's because colt spec'ed it that way. If it is is a "lesser" brand it's crap because it's out of spec. |
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Its normal It's normal for Colt. Colt builds wiggle into their specs so armorer's can be guaranteed any upper fits on any lower. Other manufacturers without this requirement can build nice, tight-fitting U/Ls. I love it. If it wiggles it's because colt spec'ed it that way. If it is is a "lesser" brand it's crap because it's out of spec. I'd imagine it does make sense for Colt to make the fit a little looser, given that uppers and lowers will be swapped around in the military that may have 40 years of age difference between the two, and they need it to work. It also makes sense that if the tolerance was controlled as closely as possible, this would be unnecessary. It would just be more expensive. For all the topics on here I see about upper/lower play/wobble/wiggle, I've never actually seen it in person. I guess I'm just lucky...or I buy things from good manufacturers. |
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Its normal It's normal for Colt. Colt builds wiggle into their specs so armorer's can be guaranteed any upper fits on any lower. Other manufacturers without this requirement can build nice, tight-fitting U/Ls. I love it. If it wiggles it's because colt spec'ed it that way. If it is is a "lesser" brand it's crap because it's out of spec. Yeah. But it's not always just Colt and "lesser brands" with play between the upper and the lower. My complete BCM has a decent amount of play between the upper and lower, and is the only AR I own that does. My DDs, Noveske and custom builds all fit nice and tight. |
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Its normal It's normal for Colt. Colt builds wiggle into their specs so armorer's can be guaranteed any upper fits on any lower. Other manufacturers without this requirement can build nice, tight-fitting U/Ls. I love it. If it wiggles it's because colt spec'ed it that way. If it is is a "lesser" brand it's crap because it's out of spec. I've never seen anyone talk down a lesser brand for upper/lower play...just crap parts. |
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Its normal It's normal for Colt. Colt builds wiggle into their specs so armorer's can be guaranteed any upper fits on any lower. Other manufacturers without this requirement can build nice, tight-fitting U/Ls. There are reasons why only Colt or colt’s spec-ed rifles goes to war in all the shit holes around the world since the 60s ... so all the clones can be “nice and tight” and be safe at home and free to go from a carpeted gun safe into a padded foam case to the range… “nice and tight” are not free… 
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