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Posted: 4/18/2016 11:33:52 PM EDT
[#1]
This pic borrowed from member Molon's old posts which shows that the F marked front sight base (FSB) are 0.040" taller than the standard A2 FSB. I'm not sure what type front sight base does the 6720 have, ask your friend if he could see a letter "F" mark at the middle of the left side of the sight base. If no F mark, if he could measure from the top of the barrel to the top shelf of the front sight base as shown in the pic, if it is the short height 1.940" the factory should have installed a taller front sight post. It seems that his front sight post is the short type and he have a short FSB that's why he's shooting high, he should contact Colt customer service and tell them about his problem. |
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Posted: 4/19/2016 10:37:07 AM EDT
[#2]
The Colt 6720 doesn't come with a "F" height FSB, they also come with a standard FSP.
You should be able to fix the problem by installing a taller FSP. I find it kind of funny that people thought it was such a big deal that the Colt AR15A4 (a gun where it doesn't matter one way or the other) didn't have an "F" height FSB but no one seems to care that the Colt 6720 (a gun where it does matter) doesn't come with an "F" height FSB. 
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Posted: 4/19/2016 10:27:23 PM EDT
[#3]
Hello, I have a colt 6720 which came with the slightly taller FSP to compensate for the non F-marked FSB. I've turned my post up a bit to get it zeroed with the MBUS it came with, but the post is not outlandishly high. Here is a picture of where it is right now, I hope this helps Note that you can see most of the round base of the post, but not the threads
i think this is the post you want, should you need to order one |
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Posted: 4/19/2016 11:10:49 PM EDT
[#4]
Quote HistoryQuoted:
Hello, I have a colt 6720 which came with the slightly taller FSP to compensate for the non F-marked FSB. I've turned my post up a bit to get it zeroed with the MBUS it came with, but the post is not outlandishly high. Here is a picture of where it is right now, I hope this helps Note that you can see most of the round base of the post, but not the threads i think this is the post you want, should you need to order one The FSP in your picture and the FSP in the Brownells link are the same FSP. It is the tapered carbine FSP which is the same height as the standard rifle FSP. |
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Posted: 4/19/2016 11:26:51 PM EDT
[#5]
Quote HistoryQuoted:
The FSP in your picture and the FSP in the brownells link are the same FSP. It is the tapered carbine FSP which is the same height as the standard rifle FSP. Quote HistoryQuoted:
Quoted:
Hello, I have a colt 6720 which came with the slightly taller FSP to compensate for the non F-marked FSB. I've turned my post up a bit to get it zeroed with the MBUS it came with, but the post is not outlandishly high. Here is a picture of where it is right now, I hope this helps Note that you can see most of the round base of the post, but not the threads i think this is the post you want, should you need to order one The FSP in your picture and the FSP in the brownells link are the same FSP. It is the tapered carbine FSP which is the same height as the standard rifle FSP. You point that out like it's a bad thing. I'm glad i posted the right FSP for the 6720 |
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Posted: 4/19/2016 11:31:53 PM EDT
[#6]
Quote HistoryQuoted:
You point that out like it's a bad thing. I'm glad i posted the right FSP for the 6720 Quote HistoryQuoted:
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Hello, I have a colt 6720 which came with the slightly taller FSP to compensate for the non F-marked FSB. I've turned my post up a bit to get it zeroed with the MBUS it came with, but the post is not outlandishly high. Here is a picture of where it is right now, I hope this helps Note that you can see most of the round base of the post, but not the threads i think this is the post you want, should you need to order one The FSP in your picture and the FSP in the Brownells link are the same FSP. It is the tapered carbine FSP which is the same height as the standard rifle FSP. You point that out like it's a bad thing. I'm glad i posted the right FSP for the 6720 That is not the correct FSP... This one is though. > Link. Or > this one < which is a little shorter than the first one I linked but it's still a little taller than the standard height FSPs. |
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Posted: 4/19/2016 11:36:26 PM EDT
[#7]
Quote HistoryQuote HistoryQuoted:
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Hello, I have a colt 6720 which came with the slightly taller FSP to compensate for the non F-marked FSB. I've turned my post up a bit to get it zeroed with the MBUS it came with, but the post is not outlandishly high. Here is a picture of where it is right now, I hope this helps Note that you can see most of the round base of the post, but not the threads i think this is the post you want, should you need to order one The FSP in your picture and the FSP in the brownells link are the same FSP. It is the tapered carbine FSP which is the same height as the standard rifle FSP. You point that out like it's a bad thing. I'm glad i posted the right FSP for the 6720 That is not the correct FSP... This one is though. > Link. the one I posted should be the .310 height as opposed to .270. Part number SP64665 for a 16" barrel at brownells and sspecialized armament |
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Posted: 4/19/2016 11:51:17 PM EDT
[#8]
Quote HistoryQuoted:
the one I posted should be the .310 height as opposed to .270. Part number SP64665 for a 16" barrel at brownells and specialized armament Quote HistoryQuoted:
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Hello, I have a colt 6720 which came with the slightly taller FSP to compensate for the non F-marked FSB. I've turned my post up a bit to get it zeroed with the MBUS it came with, but the post is not outlandishly high. Here is a picture of where it is right now, I hope this helps Note that you can see most of the round base of the post, but not the threads i think this is the post you want, should you need to order one The FSP in your picture and the FSP in the Brownells link are the same FSP. It is the tapered carbine FSP which is the same height as the standard rifle FSP. You point that out like it's a bad thing. I'm glad i posted the right FSP for the 6720 That is not the correct FSP... This one is though. > Link. the one I posted should be the .310 height as opposed to .270. Part number SP64665 for a 16" barrel at brownells and specialized armament I invoke the power of Molon to sort this all out. http://www.ar15.com/forums/t_3_18/467842_Colt_Front_Sight_Post_Primer.html 
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Posted: 4/20/2016 12:07:37 AM EDT
[#9]
boom
also, good job by Colt for being so helpful |
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Posted: 4/20/2016 12:22:39 AM EDT
[#10]
Quote HistoryQuoted:
boom also, good job by Colt for being so helpful I don't think Colt had anything to do with it and I'm pretty sure that Molon just re-posted this info that old time member Ekie originally posted. |
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Posted: 4/20/2016 7:15:32 AM EDT
[#11]
Quote HistoryQuoted:
I don't think Colt had anything to do with it and I'm pretty sure that Molon just re-posted this info that old time member Ekie originally posted. Quote HistoryQuoted:
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boom also, good job by Colt for being so helpful I don't think Colt had anything to do with it and I'm pretty sure that Molon just re-posted this info that old time member Ekie originally posted. I was being sarcastic. My bad for not being more clear on that 
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Posted: 4/20/2016 9:47:35 AM EDT
[#12]
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I was being sarcastic. My bad for not being more clear on that Quote HistoryQuoted:
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boom also, good job by Colt for being so helpful I don't think Colt had anything to do with it and I'm pretty sure that Molon just re-posted this info that old time member Ekie originally posted. I was being sarcastic. My bad for not being more clear on that Oh... I was wondering why you made the comment about Colt being helpful, I even went back and re-read Molon's post thinking that I must have missed something.
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Posted: 4/26/2016 7:33:33 PM EDT
[#13]
Just got my 6720 from grabagun with carry handle. Has the "F" marked FSB. Gotta check the build date.
I'll post pics, too. Damn, it's hot, though. |
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Posted: 4/26/2016 10:56:27 PM EDT
[#14]
Quote HistoryQuoted:
Just got my 6720 from grabagun with carry handle. Has the "F" marked FSB. Gotta check the build date. I'll post pics, too. Damn, it's hot, though. Definitely a must see to believe situation. 
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Posted: 4/30/2016 8:58:04 PM EDT
[#15]
I bought a 6720 about a month ago. It has a non-F marked FSB and a taller front post, right from the factory. It was built in January of this year, if the bag is a proper indication.
Mine required no elevation adjustment at all, and about 4 clicks of windage. It came with the MBUS, which I remove, but I installed the carry handle from my 6920. I don't think you have a sight problem. It sounds like that barrel might be bent. Even if they accidentally installed the shorter front sight post, I don't think it would cause an 18 inch deviation. |
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Posted: 4/30/2016 9:02:21 PM EDT
[#16]
Quote HistoryQuoted:
I bought a 6720 about a month ago. It has a non-F marked FSB and a taller front post, right from the factory. It was built in January of this year, if the bag is a proper indication. Mine required no elevation adjustment at all, and about 4 clicks of windage. It came with the MBUS, which I remove, but I installed the carry handle from my 6920. I don't think you have a sight problem. It sounds like that barrel might be bent. Even if they accidentally installed the shorter front sight post, I don't think it would cause an 18 inch deviation. My brother bought a 6720 a few years ago and it has a standard FSB and a standard FSP but it zeroed fine with the Matech rear sight at 50 yards. It seems like Colt is doing some odd combinations with the front sight base and post on the 6720. |
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Posted: 5/16/2016 8:38:36 AM EDT
[#17]
Quoted:
Have a friend that just got a new 6720, it is shooting about a 18 inches high out of the box. Had to move the front sight so far up that the base of the sight post is out of the sight base. The 6720 came with the plastic Magpul back up sight. Anybody else have this problem? Did you guys figure out what was going on with this rifle? |
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Posted: 5/31/2016 10:12:03 PM EDT
[#18]
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Definitely a must see to believe situation. Quote HistoryQuoted:
Quoted:
Just got my 6720 from grabagun with carry handle. Has the "F" marked FSB. Gotta check the build date. I'll post pics, too. Damn, it's hot, though. Definitely a must see to believe situation. Picked up a new 6720 with detachable carry handle and F marked front sight send me a cell number can send plenty prove that this beast doth exist in the wild |
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Posted: 5/31/2016 11:36:24 PM EDT
[#19]
Quote HistoryQuoted: Picked up a new 6720 with detachable carry handle and F marked front sight send me a cell number can send plenty prove that this beast doth exist in the wild Quote HistoryQuoted: Quoted: Quoted: Just got my 6720 from grabagun with carry handle. Has the "F" marked FSB. Gotta check the build date. I'll post pics, too. Damn, it's hot, though. Definitely a must see to believe situation. Picked up a new 6720 with detachable carry handle and F marked front sight send me a cell number can send plenty prove that this beast doth exist in the wild |
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Posted: 6/1/2016 7:01:35 AM EDT
[#20]
Sorry I wasn't clear I hadn't learned how to post pics yet was just offering a means to show someone proof
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Posted: 6/6/2016 11:02:45 PM EDT
[#21]
Good info in the thread. For those that want the details on the debate/issue but don't want to read:
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Posted: 6/8/2016 10:04:18 PM EDT
[#22]
Stop complaining its Milspec
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Posted: 6/8/2016 11:41:26 PM EDT
[#23]
Quote HistoryQuoted:
Stop complaining its Milspec |
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Posted: 6/10/2016 7:10:59 PM EDT
[#24]
I just picked up a 6720 at my LGS. Came with the carry handle, and it has an F marked FSB with no bayonet lug and it appears to also have the taller FSP. Haven't had a chance to measure yet. I'm kind of stumped about the lack of a bayonet lug...
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Posted: 6/11/2016 10:48:10 AM EDT
[#25]
Quote HistoryQuoted:
I just picked up a 6720 at my LGS. Came with the carry handle, and it has an F marked FSB with no bayonet lug and it appears to also have the taller FSP. Haven't had a chance to measure yet. I'm kind of stumped about the lack of a bayonet lug... Some odd ban state model maybe... Having both an "F" height FSB and a taller FSP is really strange.
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Posted: 6/11/2016 10:49:49 AM EDT
[#26]
Double tap.
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Posted: 6/11/2016 4:22:35 PM EDT
[#27]
Quote HistoryQuoted:
I just picked up a 6720 at my LGS. Came with the carry handle, and it has an F marked FSB with no bayonet lug and it appears to also have the taller FSP. Haven't had a chance to measure yet. I'm kind of stumped about the lack of a bayonet lug... I'd guess Colt was raiding the 6933 parts bin for .625 size fsb's the day that 6720 was made. |
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Posted: 6/11/2016 5:11:18 PM EDT
[#28]
Quote HistoryQuoted:
I'd guess Colt was raiding the 6933 parts bin for .625 size fsb's the day that 6720 was made. Quote HistoryQuoted:
Quoted:
I just picked up a 6720 at my LGS. Came with the carry handle, and it has an F marked FSB with no bayonet lug and it appears to also have the taller FSP. Haven't had a chance to measure yet. I'm kind of stumped about the lack of a bayonet lug... I'd guess Colt was raiding the 6933 parts bin for .625 size fsb's the day that 6720 was made. Gotta love em for it! I went to the indoor range today and zeroed the rifle for 25 yards. I had to move my POI up on the front sight 11 or 12 clicks to get a 25 yard zero. Windage was fine. The gun shot really well, regardless of its quirks. I noticed after getting home the FSP of the 6720 is visually in the same area as that of my 6920s and 6721. Also zeroed a MT6601 with an F marked FSB. It needed about 16 clicks on the front sight to zero. |
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Posted: 6/18/2016 5:57:23 PM EDT
[#29]
Brand new from Grabagun.com 
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Posted: 6/18/2016 6:25:45 PM EDT
[#30]
^^^ Mine is identical to that one. Maybe the models shipping with the carry handle don't come with the bayo lug, or maybe it's something Colt is doing new. 6720s now have those QD code thingies too.
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Posted: 8/2/2016 5:42:56 PM EDT
[#31]
Quote HistoryQuoted:
Hello, I have a colt 6720 which came with the slightly taller FSP to compensate for the non F-marked FSB. I've turned my post up a bit to get it zeroed with the MBUS it came with, but the post is not outlandishly high. Here is a picture of where it is right now, I hope this helps Note that you can see most of the round base of the post, but not the threads i think this is the post you want, should you need to order one OK got back with my buddy, and this is what his front sight post ended up looking like. His 6720 does NOT have a F marked front sight base. He talked to Colt about fixing it and the rep said that they would most likely replace the front sight post with a taller aftermarket one as Colt doesn't make a taller post. Also said they would pay to have it shipped both ways but it would take 30 to 45 days before it got back to him. |
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Posted: 8/2/2016 8:51:34 PM EDT
[#32]
A month to month and a half to fix a front sight post he can do in 30 seconds...
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Posted: 8/8/2016 5:07:59 PM EDT
[#33]
Got him over again yesterday with the 6720. Had time to remove the front sight post and mic it. Measures .295 tall, if a aftermarket sight post is .310 I don't think that will fix his problem.
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Posted: 8/9/2016 11:48:19 AM EDT
[#34]
It looks like it might already have Colt's taller FSP (which is supposed to have a height of 0.300) based on your measurements.
Though in your earlier post you said that the FSP appeared to be Colt's tapered carbine FSP which is supposed to have a height of 0.270... Maybe we need to see some pictures to know which FSP it really is. Is the threaded section dimpled/center drilled at the base as shown here. > Link. |
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Posted: 10/10/2016 12:44:48 AM EDT
[#35]
Hey all this is the friend with the 6720 shooting high out of the box. I have some pictures to show everyone. These are pictures of my front sight block and the post while the rifle is shooting high. The pictured position forces me to do a 6 o'clock hold to hit the center of the target at 100 yards. I think I am just going to send it back to Colt and see how things get fixed. I will keep you all updated.
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Posted: 10/10/2016 10:21:35 AM EDT
[#36]
Quote HistoryQuoted:
Hey all this is the friend with the 6720 shooting high out of the box. I have some pictures to show everyone. These are pictures of my front sight block and the post while the rifle is shooting high. The pictured position forces me to do a 6 o'clock hold to hit the center of the target at 100 yards. I think I am just going to send it back to Colt and see how things get fixed. I will keep you all updated. http://imgur.com/a/7aaB6 Looking at your pictures your front sight post appears to be Colt's taller 9MM front sight post. > Link. It's possible that the Windham Weaponry front sight post which is a little bit taller might help. > Link. If the Windham Weaponry FSP works it would be better than sending the rifle back to Colt. |
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Posted: 10/13/2016 12:27:56 AM EDT
[#37]
Cliff the front sight post was measured to the best of our abilities and it came in at .295 inches. As soon as I figure out the best way to ship the rifle it will be going back to colt.
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Posted: 10/13/2016 11:39:24 AM EDT
[#38]
Quote HistoryQuoted:
Cliff the front sight post was measured to the best of our abilities and it came in at .295 inches. As soon as I figure out the best way to ship the rifle it will be going back to colt. Yeah, that is Colt's taller 9MM FSP, .295 is very close to .300. Please keep us updated, I'm interested to find out what Colt will do to fix this. |
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Posted: 12/28/2016 6:12:55 PM EDT
[#39]
Well talked to Maddog6720 today and Colt has had his 6720 for over 2 months and he's heard NOTHING from them. Now that's customer service if you trying to get the customer to never buy your products again. He's aready talking Daniel Defence.
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Posted: 12/28/2016 8:21:14 PM EDT
[#40]
Quote HistoryQuoted:
Well talked to Maddog6720 today and Colt has had his 6720 for over 2 months and he's heard NOTHING from them. Now that's customer service if you trying to get the customer to never buy your products again. He's aready talking Daniel Defence. Well, that's kind of disappointing. Hopefully it won't take much longer to get sorted out. |
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Posted: 1/30/2017 7:24:21 PM EDT
[#41]
Quote HistoryQuoted:
Well talked to Maddog6720 today and Colt has had his 6720 for over 2 months and he's heard NOTHING from them. Now that's customer service if you trying to get the customer to never buy your products again. He's aready talking Daniel Defence. UP to 3 months now and still not back--Colt doesn't even return calls or emails from Maddog6720. |
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Posted: 1/30/2017 10:01:05 PM EDT
[#42]
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UP to 3 months now and still not back--Colt doesn't even return calls or emails from Maddog6720. Here is a recent thread where the wait is up to 4 months to have an issue taken care of. > http://www.ar15.com/forums/t_2_29/281510_Colt-quality---.html The good news is that once you are up to 4 months you might get a call. |
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Posted: 2/27/2017 7:03:18 PM EDT
[#43]
Well, 4 months and it just came back- nothing on the work order stating they fixed anything-does have a bunch of scratches and wear marks it didn't have when he sent it in including a gouge out of the forward assist button. He never got a call or email it was come back either.
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Posted: 2/27/2017 8:21:15 PM EDT
[#44]
Quote HistoryQuoted:
Well, 4 months and it just came back- nothing on the work order stating they fixed anything-does have a bunch of scratches and wear marks it didn't have when he sent it in including a gouge out of the forward assist button. He never got a call or email it was come back either. So, everything looks the same other than some new rough handling marks? I will be interested to know if it shoots any different. |
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Posted: 3/8/2017 7:01:44 PM EDT
[#45]
Well, no difference in how it is shooting, still really high. It's on it's way back to Colt.
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Posted: 3/8/2017 7:14:28 PM EDT
[#46]
Quote HistoryQuoted:
Well, no difference in how it is shooting, still really high. It's on it's way back to Colt. Wow... I don't think that's the first time that I've heard of them sending back something that they didn't fix. I love Colt but that really sucks. |
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