

Take a pic from the top down of the entire rifle. I bet its the hand guard. Do you have another hand guard you could swap to check?
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did you lap the front of the receiver face?
https://www.ar15.com/forums/AR-15/Lapped-upper-receiver/118-732745/?page=1&anc=bottom#bottom |
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Quoted:
did you lap the front of the receiver face? https://www.ar15.com/forums/AR-15/Lapped-upper-receiver/118-732745/?page=1&anc=bottom#bottom View Quote |
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I had this problem too. Lapped the face to square, barrel centered now.
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I guess it depends on how comfortable you are taking the upper apart. If it's easy for you to pull it apart, look at the interface between the upper receiver and the barrel extension. If it doesn't square up, then you'll need to lap the receiver face. If the fit is square, then there's no reason to lap.
I'd shoot the rifle first. If it shoots well, then you have a cosmetic issue, not a functional problem. The amount of windage you have to dial will also indicate whether the barrel's bore is aligned with the upper receiver's rail. Most likely, you have a cosmetic issue with your rail. If that bothers you, send it back. But first you have to figure out whether you do. If the rifle shoots well, that rail wouldn't bother me. For what it's worth, the most accurate rifle I own (a WOA that shoots under .75 moa regularly) does not sit in the center of its Midwest Industries handguard. I really couldn't tell you whether my others do. It's not something I've ever paid much attention to. Also, you'll need match ammo and a decent scope for testing the rifle's function. Shooting 3 moa ball ammo won't tell you anything. Federal Gold Medal Match with 69 grain Sierra Match Kings, Black Hills' .223 loading of 77 grain Sierra Tipped Match Kings, or even Hornady 50 grain V-Max (not Superperfromance) should all shoot well enough to identify whether the rifle has a functional problem. One of the loads should get you 1 moa or better five shot groups at 100 yards with at least a 6x scope with a fine reticle. |
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OP, it looks like the barrel is slightly crooked in the upper from your picture of the feed ramps. That would cause the gas block to look crooked in the hand guard even though it is straight on the barrel and the rear screw goes into the barrel dimple.
If you pull the hand guard and barrel nut how tight does the barrel extension index pin fit in the index pin slot of the upper? Thank You Andy MI |
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I join the chorus in suggesting that this is probably cosmetic and related to the handguard only. Shoot it and report back on accuracy and whether there is any difficulty with the windage adjustment on your scope. Make sure the scope is mounted entirely on the upper receiver and not out over the rail.
If it shoots well and the rifle zeroes without excessive scope windage adjustment from its mechanical zero (center), then your issue is most likely with the handguard, and may simply be the way you installed it. Adjust your scope for mechanical zero. Go all the way to one side on windage. Start counting clicks all the way to the other side. Then divide that number by two and move it that many clicks back to the middle. Do the same for the elevation turret. This is a good beginning point. That way you can compare your upper receiver to the barrel. If the rifle zeroes without a lot of windage adjustment on the scope, then all is well with the barrel. Note, that this will not be exact even with a perfectly parallel upper receiver and barrel, as their is some slight horizontal deflection of the bullet (POI to POA) imparted by barrel whip and by bullet spin. But, you ought not be maxing out windage or anything close to that. A 50 yard zero should do, but go to 100 yards, if you can. There also could be a vertical alignment issue, but based on the photo, I'm assuming the problem to primarily be that the handguard is off to the side, horizontally, in relation to the barrel. The one picture I was hoping to see, someone else suggested; top down view of the completely assembled upper, barrel and rail. That would show the upper receiver slots, the rail upper slots and the barrel all from looking straight down. |
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We always want our customers to be happy.
If you believe the handguard is the issue I will arrange exchanging it and have you try another one. please send me an email. [email protected] |
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Quoted:
We always want our customers to be happy. If you believe the handguard is the issue I will arrange exchanging it and have you try another one. please send me an email. [email protected] View Quote Chris |
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Quoted:
OP, it looks like the barrel is slightly crooked in the upper from your picture of the feed ramps. That would cause the gas block to look crooked in the hand guard even though it is straight on the barrel and the rear screw goes into the barrel dimple. If you pull the hand guard and barrel nut how tight does the barrel extension index pin fit in the index pin slot of the upper? Thank You Andy MI View Quote |
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The entire barrel is offset inside the handguard though, not just the gas block. There is a larger gap between the barrel and the right side of the handguard, than there is between the barrel and the left side of the handguard.
Even with the gas block removed, I think it would still be visibly offset. Even if I cut off the index pin, I should be able to spin the barrel in the receiver and it would still be straight in the handguard at any position, no? |
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The cant looks gradually increasing the farther the distance from the receiver. I am in the face the receiver camp.
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I contacted Spikes as well to see what their thoughts are on it. Was recently in contact with one of their techs regarding a BCG issue, which was handled very well. Shot him an email.
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Quoted:
The cant looks gradually increasing the farther the distance from the receiver. I am in the face the receiver camp. View Quote I'm putting 50 on one, 50 on another, 00 on the remainder. ![]() I've never seen a rcvr even close to that bad but I reckon they're out there. I'd be forced to disassemble, put it on a flat surface, shine a light, go from there. |
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Damn. Looks to me on the pic showing the rail to rail alignment, it's perfect. Which takes me back to the barrel for whatever reason. My mind (
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Put it back together, torqueing the barrel correctly, mount and mechanically zero the scope. See if it will zero at 50 or better yet 100 yards. Then report back.
If it zeros without a lot of changes in windage, its the rail. Get with MWI. They will make it right. If it requires a lot of if windage from mechanical zero to zero on the target, then its the barrel extension or the upper receiver face. |
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If not square optics and barrel sights might not be adjustable enough to hit POA. I had this problem with iron sights, lapped it, no more issue.
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I got a bad barrel nut once that caused the same problems. The seller didn't help, because I'd had it a while before it was installed.
Had to buy a new one on my dime. |
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Quoted:
Very well could be. That was my first thought. Followed by the handguard. Followed by the barrel / extension. I'm putting 50 on one, 50 on another, 00 on the remainder. ![]() I've never seen a rcvr even close to that bad but I reckon they're out there. I'd be forced to disassemble, put it on a flat surface, shine a light, go from there. View Quote 2 degrees at at 12" is .420" (near 7/16"). Even 1 degree at 12" is .210" |
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I am sending the entire upper to MI. Myself, or Pete if he wishes, will report back with the findings. Great folks.
The gun industry has some of the best customer service I've ever dealt with. |
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Quoted:
I am sending the entire upper to MI. Myself, or Pete if he wishes, will report back with the findings. Great folks. The gun industry has some of the best customer service I've ever dealt with. View Quote Have a great weekend all. Pete MI |
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Quoted: Once the upper arrives and we have had a chance to go through it we will report back with our findings. Have a great weekend all. Pete MI View Quote |
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Quoted: This is exactly the reason why I like MI so much. They step up and help their customers and never leave them out to dry. This is why they also earn so many dedicated life long customers like myself. View Quote Gives me peace of mind letting the pros look at it, rather than just swapping out parts through the mail until we find the issue. |
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Quoted:
We received the upper parts today. Please understand that all photos/ videos were taken with a phone. The first thing we checked was our handguard. The handguard was well within our acceptable deviation. The only thing we found with it was one of the M-LOK slots on the bottom where an accessory improperly installed had caused some deformation of the slot. Here is a photo of the slot. https://i1185.photobucket.com/albums/z349/Midwest_Ind/C031F82E-D942-4599-BAB8-1E6A74107517_zpsicillytv.jpeg The next thing we tested was the barrel to barrel extension. There is no issue there. Please see the video. ![]() We then tested the upper. What we found was that the face was substantially untrue and required lapping to meet our standards. Here is a photo after just a little lapping: https://i1185.photobucket.com/albums/z349/Midwest_Ind/7D19857D-89E0-4051-A252-427F07700C46_zps7svvokjp.jpeg Here is the face lapped to allow the barrel to sit straight: https://i1185.photobucket.com/albums/z349/Midwest_Ind/68D7B8EE-3321-40E6-A755-926153CEB138_zpsv54kz4ka.jpeg We then assembled the upper. The barrel is much more centered in the handguard. The upper was built the way our complete uppers are assembled. https://i1185.photobucket.com/albums/z349/Midwest_Ind/85863C32-B0E2-468C-B8E0-E219146DBB9F_zpsz80cybf8.jpeg Only requirement now is for the OP to install his muzzle device before dropping in his BCG and charging handle and the upper is ready for the range. Thanks, PETE View Quote Many of us have been saying for a long time that lapping makes a difference in centering barrels in the rail. Its nice to have a manufacturer's photos and description of a receiver that is not square. Its also nice to see a standard receiver lapping tool sitting in the background. These tools WORK. While a receiver and barrel that sit crooked can still be zero'd there is no functional benefit to leaving them that way. By lapping the receiver I, as well as many others, have observed that the rifle's zero is near the mechanical center of your windage. Every receiver that I assemble gets lapped. All my rifles zero near the center of their windage with in a few clicks. For a OCD builder like me, it's glorious. Great work PETE! |
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Quoted:
We received the upper parts today. Please understand that all photos/ videos were taken with a phone. The first thing we checked was our handguard. The handguard was well within our acceptable deviation. The only thing we found with it was one of the M-LOK slots on the bottom where an accessory improperly installed had caused some deformation of the slot. Here is a photo of the slot. https://i1185.photobucket.com/albums/z349/Midwest_Ind/C031F82E-D942-4599-BAB8-1E6A74107517_zpsicillytv.jpeg The next thing we tested was the barrel to barrel extension. There is no issue there. Please see the video. ![]() We then tested the upper. What we found was that the face was substantially untrue and required lapping to meet our standards. Here is a photo after just a little lapping: https://i1185.photobucket.com/albums/z349/Midwest_Ind/7D19857D-89E0-4051-A252-427F07700C46_zps7svvokjp.jpeg Here is the face lapped to allow the barrel to sit straight: https://i1185.photobucket.com/albums/z349/Midwest_Ind/68D7B8EE-3321-40E6-A755-926153CEB138_zpsv54kz4ka.jpeg We then assembled the upper. The barrel is much more centered in the handguard. The upper was built the way our complete uppers are assembled. https://i1185.photobucket.com/albums/z349/Midwest_Ind/85863C32-B0E2-468C-B8E0-E219146DBB9F_zpsz80cybf8.jpeg Only requirement now is for the OP to install his muzzle device before dropping in his BCG and charging handle and the upper is ready for the range. Thanks, PETE View Quote ![]() Nice. And damn good illustrations here. (Why didn't anybody suggest lapping before?) ![]() ![]() |
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Midwest Ind killing the customer service game! Y’all are awesome!
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Quoted:
We received the upper parts today. Please understand that all photos/ videos were taken with a phone. The first thing we checked was our handguard. The handguard was well within our acceptable deviation. The only thing we found with it was one of the M-LOK slots on the bottom where an accessory improperly installed had caused some deformation of the slot. Here is a photo of the slot. https://i1185.photobucket.com/albums/z349/Midwest_Ind/C031F82E-D942-4599-BAB8-1E6A74107517_zpsicillytv.jpeg The next thing we tested was the barrel to barrel extension. There is no issue there. Please see the video. ![]() We then tested the upper. What we found was that the face was substantially untrue and required lapping to meet our standards. Here is a photo after just a little lapping: https://i1185.photobucket.com/albums/z349/Midwest_Ind/7D19857D-89E0-4051-A252-427F07700C46_zps7svvokjp.jpeg Here is the face lapped to allow the barrel to sit straight: https://i1185.photobucket.com/albums/z349/Midwest_Ind/68D7B8EE-3321-40E6-A755-926153CEB138_zpsv54kz4ka.jpeg We then assembled the upper. The barrel is much more centered in the handguard. The upper was built the way our complete uppers are assembled. https://i1185.photobucket.com/albums/z349/Midwest_Ind/85863C32-B0E2-468C-B8E0-E219146DBB9F_zpsz80cybf8.jpeg Only requirement now is for the OP to install his muzzle device before dropping in his BCG and charging handle and the upper is ready for the range. Thanks, PETE View Quote |
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Great outcome!
What companies do you all recommend for receiver lapping? I have the same exact problem with one of mine. |
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Midwest Industries is awesome. How many other companies would do this for a customer? The only part of that was the rail. Would Spikes do this for their customers? I am going to go out on a limb and say no.
I have a few MI rails, but I think after seeing how they go out of their way to make their customers happy, my next rifle will be a complete MI. They certainly have strict QC. |
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Hey guys. Been speaking with Pete personally. Not feeling well today and will post more later.
I just wanted to at least publicly mention how outrageously appreciative I am of these guys. MI went out on a limb to help me out, knowing there was a good chance that their product may not be the issue. I’ve always had mostly good results dealing with firearm-related manufacturers. However, this was beyond “customer service.” I can’t thank Pete and the armorer enough. Also, not to go without saying thank you all for your assistance as well. Joined this site when I was barely old enough to buy a firearm, and has been pivotal in nearly everything I’ve learned about them since. This was no exception. Chris |
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Glad we were able to get this fixed.
We appreciate our customers and we want you all to know that. Quoted:
Great outcome! What companies do you all recommend for receiver lapping? I have the same exact problem with one of mine. View Quote note to the OP: your upper is on the UPS truck. |
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Quoted:
Hey guys. Been speaking with Pete personally. Not feeling well today and will post more later. I just wanted to at least publicly mention how outrageously appreciative I am of these guys. MI went out on a limb to help me out, knowing there was a good chance that their product may not be the issue. I’ve always had mostly good results dealing with firearm-related manufacturers. However, this was beyond “customer service.” I can’t thank Pete and the armorer enough. Also, not to go without saying thank you all for your assistance as well. Joined this site when I was barely old enough to buy a firearm, and has been pivotal in nearly everything I’ve learned about them since. This was no exception. Chris View Quote |
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MI, You make some great stuff, and great job helping that man out.
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Quoted:
Glad we were able to get this fixed. We appreciate our customers and we want you all to know that. note to the OP: your upper is on the UPS truck. View Quote Did you guys have to remove the gas block? Just curious how difficult it is after using the included red threadlocker. First time sitting down on the computer and looking at this stuff on a normal screen. Very cool seeing the process. Definitely above my abilities/resources haha Crazy how untrue the face of the receiver was. Why are most receivers not lapped from the factory? Is it more of the finish, or the metal that's uneven? This is the second Spikes product I've had an issue with recently during this build. The other was the bolt/extractor on the NiB BCG, but for what it's worth, their tech handpicked a new bolt and carrier combo and quickly had it exchanged. They made it right, so I'm a happy camper. Just disappointed in quality control nowadays. Regarding the M-Lok ding, definitely my fault. That was after assembling and disassembling the darn thing multiple times in frustration trying to convince myself to just live with the crooked upper. Got lazy and didn't use the FAT wrench that time, and the screw hung up. Oops! Can't wait to finally get this thing to the range. Going to be paired with a Vortex Viper PST II 5-25x50. Locally only have 100yds, but hoping to eventually get out of town where I can open it up further. |
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Quoted:
Great outcome! What companies do you all recommend for receiver lapping? I have the same exact problem with one of mine. View Quote At about 48 seconds... ![]() Accurizing the AR-15 - Part 3: Receiver Prep & AR-15 Barrel Installation The whole video collection is here... and well worth watching. https://criterionbarrels.com/media/accurizing-the-ar-15-video-series/ |
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@Midwest_Ind
Impressive to see you folks help out us "gunny" folk !! I am a fond consumer of your products... even more so now. You all nailed this. Again, thanks for being a tech supporting and manufacturing member here. This made my day. |
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@Midwest_Ind
Just found this thread. Holy moly. I don't own any MI products. That needs to change. Absolutely amazing CS. Somebody needs to tack this thread not only to make the point about truing the face of the receiver but also to give great credit to MI for going to such lengths to take care of a customer. Exceptionally well done, MI. |
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I lap all my receivers using that tool, but i do it by hand, I don't use a power drill
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There is a reason I use the Vltor MUR for all of my builds. MI is awesome. Next build will be all MI
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Quoted: You... Pacific Tool and Gauge sells the tool for 30 bucks. ( Do not buy the cheap poor fitting Wheeler version ) Buy some non in bedding ( for aluminum ) lapping compound ( Brownells ) and do it . It is super easy. At about 48 seconds... ![]() The whole video collection is here... and well worth watching. https://criterionbarrels.com/media/accurizing-the-ar-15-video-series/ View Quote View All Quotes View All Quotes Quoted: You... Pacific Tool and Gauge sells the tool for 30 bucks. ( Do not buy the cheap poor fitting Wheeler version ) Buy some non in bedding ( for aluminum ) lapping compound ( Brownells ) and do it . It is super easy. At about 48 seconds... ![]() The whole video collection is here... and well worth watching. https://criterionbarrels.com/media/accurizing-the-ar-15-video-series/ Quoted:
I lap all my receivers using that tool, but i do it by hand, I don't use a power drill For drill or by hand how do you know when to stop? |
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I do it by hand to not over grind the face. I stop before all of the black adonizing is gone, when there's just a small bit remaining
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Absolutely stellar, above and beyond CS by MI. I don't currently own any of your products but that will be changing the next time I get the itch for a build.
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Quoted:
Absolutely stellar, above and beyond CS by MI. I don't currently own any of your products but that will be changing the next time I get the itch for a build. View Quote |
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