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Posted: 11/19/2025 2:17:25 PM EDT
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What's everyone's preference? I see the Wheeler tool has a flex drive while the Brownells and PTG tools have a fixed drive. Does one have any benenfit over the other? Of all the lapping tools available, which one has the most even lapping surface to ensure a consistent, squared face? |
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Originally Posted By Bebop_941: What's everyone's preference? >most even lapping surface to ensure a consistent, squared face? Consider having them faced true on a lathe. https://tp555.com/ |
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Lapping isn't wrong...but it sort of is. The thing is, you need the face to be true to the threads...not just true to the bore. Its probably more critical that it be true to the threads and top rail than to the bore...except the lapping tool makes the face true to the bore. I have lapped several receivers and it can help. You can clearly see removed metal on one side. That said, I don't have a way to measure runout on the threads vs the bore...so maybe? |
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I have used a basic Wheeler lapping tool. At 25 yards I have seen a 6” point of impact shift towards center after lapping. It doesn’t take much make a barrel off kilter |
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Thank you for the advice so far. I thought I had an untrue reciever but now I'm second guessing that. I have a barrel that's pointing slightly to the right of the receiver when installed by about 10 thousands. I thought it may be the reciever face but then it does the same thing in 5 other receivers. So then I thought the barrel may be crooked in the barrel extension. But then, it looks straight in a sixth recie er. So now I'm investigating if the handguard is going on crooked, making the barrel look crooked. I want to figure out what it may be before I start modifying anything. It's such a slight deviation I'm finding it difficult to determine where the problem is coming from. |
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If possible, you might be able to use a laser pointer as an alignment tool... accurate setup would be the issue to solve. Might be able to align it down the receiver rail to see if the front of the barrel is aligned... or maybe get one of those bore sighting lasers and see if the sights align with the dot (horizontally) |
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I second this, great prices and the guy was great to work with. |
| I use a wheeler but, take this bit of advice... don't go after your receiver with a drill. Hand lapping will take longer but not much. You can feel the cut and know precisely how much pressure you are applying. It's far easier to be sure you are not applying sideways pressure. It's really the best way. |
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Number one: The above. There is no better than the above. Number two: Brownells or PTG fixed tool in a drill press with a fixed vice to hold the receiver. |
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Originally Posted By FedDC: Lapping isn't wrong...but it sort of is. The thing is, you need the face to be true to the threads...not just true to the bore. Its probably more critical that it be true to the threads and top rail than to the bore...except the lapping tool makes the face true to the bore. I have lapped several receivers and it can help. You can clearly see removed metal on one side. That said, I don't have a way to measure runout on the threads vs the bore...so maybe? You really just want the barrel extension flange to mate well with the receiver face and for that to line the barrel bore up with the top rail. That minimizes windage adjustments and shifting of the barrel when firing. Unless a visible defect exists in the receiver face which causes it not to mate well with the barrel extension flange, I suspect grinding away with hand tools is more likely to make things worse than better. I own a lapping tool but have never seen a reason to use it. As you point out, the lapping tool attempts to square the receiver face to the receiver bore. The true goals are a solid mating surface between the extension flange and the receiver face and alignment of the barrel bore with the top rail. Squaring the receiver face to the receiver bore might or might not help achieve those goals. |
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Originally Posted By FedDC: Lapping isn't wrong...but it sort of is. The thing is, you need the face to be true to the threads...not just true to the bore. Its probably more critical that it be true to the threads and top rail than to the bore...except the lapping tool makes the face true to the bore. I believe we need two tools. One to verify that the threads are concentric to the bore that the carrier rides in. One to put the barrel extension in line with the carrier bore in the receiver. Oh, yeah, and another one to verify that the barrel extension is in line with the barrel bore. My proposed verification tools aren't meant to fix anything, their purpose is to reject uppers and barrels for being out of spec. |
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So I finally got around to doing this and went with the Brownells tool. I did it by hand since a power tool seems overkill for this process and introduces too many opportunities for it to get messed up quickly. My question is, how far do you normally take it? I see a lot of people go until it's silver all the way around. That seems too much to me. I did it until about 40-50% of the face was exposed aluminum. The rest is still anodized but there are is radial wear from the tool all the way around the receiver face so the tool is making contact 360° around the face. The exposed aluminum is also on the side that would be high based on the way the barrel was misaligned when installed so it confirms that the tool is squaring the correct area. Just curious how ya'll do it and how far you go. |
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