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Posted: 9/12/2003 4:00:11 AM EDT
[Last Edit: 9/12/2003 4:03:40 AM EDT by CJan_NH]
First off, thanks for looking

I have two preban Colt 6601 HBARs that have sear blocks. The bolt carriers on both guns are completely cut out at the bottom, unlike most of the carriers I see on the market. I presume they are cut to clear the sear block.

Is there an advantage for me to remove it? I was thinking that the wraparound carriers might be more durable than what I have. Is this really an issue though, or am I looking for a solution to a problem that doesn't exist?

Lastly, if removing the block is a good idea is this a DIY job or should I look for a smith? I've got a set of punches and a Dremel tool so I should have what I need to do it.

Thanks in advance for your help.
Link Posted: 9/12/2003 4:16:31 AM EDT
The advantage to removing it would be for adding a match trigger, or for a RDIAS. Some match triggers won't fit with the block, and an RDIAS won't fit either. As far as removal, if you are a handy guy I don't see why you couldn't do it if you are very careful. There was a posted instruction on how to do it using 'hydraulics.' I wanted to try it for myself but another member had bad luck using that method so I passed because it was not my weapon. I didn't want to chance causing any damage to a Colt preban reciever. I would probably try it on my own weapon if I had one.
Link Posted: 9/12/2003 5:23:31 AM EDT
I think I would have to if I had such a Colt. It's one of the reasons why I'll probably get a Colt of that era.
Link Posted: 9/12/2003 11:41:47 AM EDT
Most pistol caliber conversion uppers that are blow-back operated require the use of weighted carriers, and cannot be cut to acommodate the Stupid Colts receiver block. By all means, mill that thing off so that you can use standard GI (read:stronger) bolt carriers that don't have to be cut off on the bottom.
Link Posted: 9/12/2003 11:49:33 AM EDT
Thanks for the replies guys. Is there a tutorial somewhere on how to do it?
Link Posted: 9/12/2003 12:03:51 PM EDT
an m16 bolt carrier will NOT work with the sear block an ar-15 bolt carrier WILL work with the sear block the only reason the bolt carrier is cut is so you coulnt use a lightning link type device to go full auto...............
Link Posted: 9/12/2003 12:04:06 PM EDT
CJan_NH, I have the exact same rifle as you do. The block is in there for two reasons. 1) To prevent the use of an autosear of some sort and 2) to prevent the use of an M16 bolt carrier not a standard AR15 carrier. There is a slight difference. I have a postban bushy that fits on my 6601 lower and functions fine with the standard AR15 carrier. On a side note what is the sear block and the pin that holds it in place made from? I'm in the process of stripping the original anodizing off of my lower and plan to re-anodize it a different color soon. As some of you might know anodizing can only be accomplished on aluminum. If the block and pin are made from steel then it will have to be removed before I can re-anodize.
Link Posted: 9/12/2003 12:07:27 PM EDT
Originally Posted By CJan_NH: First off, thanks for looking [:)] I have two preban Colt 6601 HBARs that have sear blocks. The bolt carriers on both guns are completely cut out at the bottom, unlike most of the carriers I see on the market. I presume they are cut to clear the sear block. Is there an advantage for me to remove it? I was thinking that the wraparound carriers might be more durable than what I have. Is this really an issue though, or am I looking for a solution to a problem that doesn't exist? Lastly, if removing the block is a good idea is this a DIY job or should I look for a smith? I've got a set of punches and a Dremel tool so I should have what I need to do it. Thanks in advance for your help.
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No reason to remove it. Since the 6601s also have large pin FC parts, you cannot easily use a RDIAS or Match Trigger. I guess if you had a RLL you could, but it seems to me the easiest option is to just get a Bushmaster lower.
Link Posted: 9/12/2003 12:29:30 PM EDT
Originally Posted By TexRdnec: an m16 bolt carrier will NOT work with the sear block an ar-15 bolt carrier WILL work with the sear block the only reason the bolt carrier is cut is so you coulnt use a lightning link type device to go full auto...............
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Oh. If a standard garden variety AR15 carrier will work with the block then I don't care about removing it. If I ever get into NFA I'll buy something else to convert. Thanks for the info.
Link Posted: 9/12/2003 12:30:58 PM EDT
Originally Posted By oneshot1kill: There was a posted instruction on how to do it using 'hydraulics.' I wanted to try it for myself but another member had bad luck using that method so I passed because it was not my weapon.
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I tried the hydraulic method and thought it sucked. It certainly didn't work. I wound up removing that sear block through careful and judicious use of a Dremel tool equipped with a fiber cutoff wheel.
Link Posted: 9/12/2003 1:23:52 PM EDT
Originally Posted By CJan_NH: Oh. If a standard garden variety AR15 carrier will work with the block then I don't care about removing it. If I ever get into NFA I'll buy something else to convert. Thanks for the info.
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Then you have nothing to worry about. This subjecy was discussed not too long ago. Here's a photo I took showing the non-interaction between a standard AR15 bolt carrier and a Colt sear block: [img]http://photos.ar15.com/ImageGallery/Attachments/DownloadAttach.asp?iImageUnq=15199[/img]
Link Posted: 9/12/2003 5:51:28 PM EDT
Nice pic Boomer, I couldn't remember who it was at first but it was you who posted about undergoing some problems using the hydraulic removal technique.
Link Posted: 9/12/2003 6:39:28 PM EDT
Boomer
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Thanks for the pic Boomer. BTW, where did you get that carrier?
Link Posted: 9/13/2003 1:36:47 AM EDT
Originally Posted By CJan_NH: BTW, where did you get that carrier?
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Out of a green label Colt.
Link Posted: 9/13/2003 8:58:49 AM EDT
Originally Posted By Boomer:
Originally Posted By CJan_NH: BTW, where did you get that carrier?
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Out of a green label Colt.
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Ahhh. Both of my HBARs are circa 1991. I think that makes then blue label.
Link Posted: 9/13/2003 10:34:39 AM EDT
Check out biggerhammer. They have a pretty nice listing of colt variants by label color. The Blue boxes are all lug bobbed but include rifles with and without mag fences, blocks, large/small front pivot, and large/small fire control pins. How long and how many wheels does it take to demel out the block? RW
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