![]() ![]() It's built on a mis-matched Anderson upper and lower. I have one AR15 that exhibits the proverbial "bank vault" fit between the upper and lower. But, I don't notice it on mine unless I torque around on the rifle. There will likely still be a bit of play. This won't make your AR15 feel like a bolt gun. It only takes a few minutes for the glue to harden. If there is a best part=> If you try it and you don't get exactly what you are after, add more glue to the pad and go again. If you've got a glue gun, a rifle with some sloppy fit you'd like to tighten up, something to use as a wedge while the glue cools, and 20 minutes to kill. And, if I don't like it, I can pop that little glue pad out of the lower with no wear to me, the rifle, or my wallet. But, the glue gun was sitting in the garage. (For rifles that already shoot really well? Talk about throwing good money after bad.) I could have bought accuwedges and pins and other bits and bobs that would eliminate the slop. Yes, I could have replaced the uppers and lowers with units costing several x the money. This is not something that can be said about over-sized pins, tensioning screws (one of the rifles is built on an Aero M4E1 enhanced lower), or other bits of AR15 "magic." Well, it works, and I can still easily open the rifles without tools. When someone suggested the hot glue gun, that was an idea that is sufficiently easy, cheap, and reversible that I thought "What the hell, I've got a few minutes." I also didn't risk gluing my gun together permanently with bedding compound. I didn't care enough about the slop between the receivers to do anything about it before I saw this thread, because they all shoot really well. Has the accuracy improved? Probably not, and I've only shot one since the mod. On the rifles this was done to, the slop is not totally eliminated, but it is so much reduced that they feel like different guns. The index card was just enough shim to make the rear take down pin slightly difficult to push home. ![]() I also put an index card between the upper and lower, near the front take down pin (as a wedge), while the glue was cooling. Well, a bit of oil on the rear upper receiver mounting support (and a good wiping down of the lower receiver to remove any oil) and a blob of glue down in that recess. So I've got a couple of rifles with somewhat sloppy fit. You are going to find it isn't as conclusive or decisive as you'd think. I suggest you look up the actual US Army report, and actually read it. 002-005 plastic shim stock off Amazon, and cut some for yourself.Īnd before someone says upper to lower fit doesn't matter. look up some of the videos on youtube, and order some. So if you are capable, and don't feel like buying a different lower or upper. I have used the old "X-Shims" to snug up fit. In this case, IMHO, bedding and / or shimming can help. instead of just offering help, they have to be "right". Some people just have tell everyone else how wrong they are. And more people should tell others to give it a try. Sometimes your time can help produce the advantage desired. You don't have to have the "best", more expensive parts to produce respectable numbers. Not all of use can afford every upper and lower be a work of art and perfection. Self reliance should be something to be proud of. according to some in this tread, those motorheads should have bought a Corvette. your time, your effort, can produce improvements. I bet people said the same thing to folks supping up their old Fords, Chevy's and Dodge's. ![]() If it wasn't for the AR-Lego aspect, I'd probably be more into bolt guns. They also fit some of the others but not all. I have a couple uppers that I like to fit to one lower, all set up for prone 600/1000. The soft approach with the wedge feels tight but is it really? When things go bang does the wedge give? Maybe save that to correct wear.īedding does sound like an option but making it pretty around the edges where it might be seen takes skill You could always ream the holes to match an oversize pin and get at least a good one point fore and aft fit relying on the upper to hold everything together nice and tight. Or are you stuck with a matched set for every purpose? I'm sure for the money I would really be pissed if they didn't fit perfect.Ĭan you buy a 3 or 4 piece matched set? 3 uppers all matched to one lower? I would probably agree with if I had ever bought a premium matched receiver set. ![]()
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