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Posted: 4/19/2017 2:33:41 PM EDT
I just purchased a Anderson stripped lower and am wanting to mate it with
my Colt upper MT 6551 Manufactured 1999.

Are there any problems that I should be aware of matching
these up??

Nick
West Virginia
Link Posted: 4/19/2017 2:50:23 PM EDT
Not if both are in spec. Maybe some color variation in the anodizing.
Link Posted: 4/19/2017 4:43:50 PM EDT
Not as long as your lower isn't some goofy ban era lower, which I don't believe it should be with a '99 production date.
Link Posted: 4/19/2017 4:55:19 PM EDT
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Quoted:
Not as long as your lower isn't some goofy ban era lower, which I don't believe it should be with a '99 production date.
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Ban ended in '04, so that is "ban era". The only issue I know of is colt used a large front pin at some point. If your front pin on your upper is bigger than 1/4" you will need a special bushing that only costs a few cents. I think JSE surplus has it if you need it.
Link Posted: 4/19/2017 5:01:02 PM EDT
Building a 10.5 AR pistol now and using an Anderson lower for the first time.  Everything went together fine except for the bolt catch plunger didn't seem to want to go in deep enough to let the bolt catch line up with the roll pin.  Thought maybe hole wasn't drilled deep enough.  Looked in the hole and it was half full of some crud.
Cleaned it out, no problems, went together like it should, lesson learned. Just waiting for a trigger in the mail and I'll be ready to go shoot.
Link Posted: 4/19/2017 5:07:22 PM EDT
I probably didn't ask the question properly; the Anderson stripped lower
receiver is a new purchase from Brownell's and my upper is my Colt
manufactured 1999.

I have anticipated the possibility of the pivot pin needing replaced but
as far as the gun functioning properly, rounds feeding,
that is my main concern.

Thanks for your comments and advise so far.

Nick
Link Posted: 4/19/2017 5:13:14 PM EDT
Once an upper and lower are mated, you start the reproductive cycle, and before you know it, many other rifles appear.

But no, there should be no problem.
Link Posted: 4/19/2017 5:30:43 PM EDT
Discussion ForumsJump to Quoted PostQuote History
Quoted:

Ban ended in '04, so that is "ban era". The only issue I know of is colt used a large front pin at some point. If your front pin on your upper is bigger than 1/4" you will need a special bushing that only costs a few cents. I think JSE surplus has it if you need it.
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+1. Great point. I spaced that, and I am dealing with that on my current build

OP, as stated by AASG, there are 2 sizes for the front pivot pin hole: 0.310" and standard  0.250". Adapter bushing again takes care of that. Pic below
Attachment Attached File
Link Posted: 4/19/2017 7:07:33 PM EDT
Discussion ForumsJump to Quoted PostQuote History
Quoted:
Ban ended in '04, so that is "ban era". The only issue I know of is colt used a large front pin at some point. If your front pin on your upper is bigger than 1/4" you will need a special bushing that only costs a few cents. I think JSE surplus has it if you need it.
View Quote View All Quotes
View All Quotes
Discussion ForumsJump to Quoted PostQuote History
Quoted:
Quoted:
Not as long as your lower isn't some goofy ban era lower, which I don't believe it should be with a '99 production date.
Ban ended in '04, so that is "ban era". The only issue I know of is colt used a large front pin at some point. If your front pin on your upper is bigger than 1/4" you will need a special bushing that only costs a few cents. I think JSE surplus has it if you need it.
You're right. I'm getting old and seem to easily confuse my decades. I was thinking '09 and typing '99.

As stated, if your receiver has a pivot pin diameter larger than. 250" you'll need to use an adapter or a pivot pin bushing. Brownell's I believe has a couple different options in stock to allow the two to be used together.
Link Posted: 4/19/2017 7:52:17 PM EDT
I've used several large hole colt uppers on standard lowers with a bushing, no problem at all.
Link Posted: 4/19/2017 9:13:35 PM EDT
Thanks again for the quick responses guys.

This site is definitely the place to come to for good, solid advise.

Really appreciate the help

Nick
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