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3/27/2004 6:12:40 AM EDT
I looked at a used, 16", mid-length, chrome lined barrel from Armalite.  The front sight tower was mounted with socket head bolts rather than pins.

Is this the way the factory does it?  Are there any indexing slots in the barrel to help align the tower to the bore?  Looks like it could be a PITA to realign if ever removed.
3/27/2004 7:38:16 AM EDT
[#1]
Yes, that's how Armalite at least used to do it.

I tried ordering a pre-ban mid-length barrel from them a while back.  First time, they sent a barrel with dinged threads.  It had the FSB you mentioned.  Second try they sent a post-ban with weaver block.  Third time they got it right, but it had a pinned front sight.
3/27/2004 7:55:20 AM EDT
[#2]
From my understanding the preban "gov't" profile midlengths were pinned.

New midlengths are simply screwed in place - this is cheaper and it is easier to remove and add a FF tube etc.


-Kevin
3/28/2004 5:48:10 AM EDT
[#3]
Thanks for the info.  This one was a pre-ban and I think it was heavy under the hand guards.  No Idea when it was made.
3/28/2004 9:24:58 AM EDT
[#4]
Quoted:
From my understanding the preban "gov't" profile midlengths were pinned.

New midlengths are simply screwed in place - this is cheaper and it is easier to remove and add a FF tube etc.


-Kevin
View Quote


I've been trying to find a preban w/ a flat top  but have been unssuccessful.  How tough are the screwed in place FSB vs pinned?
I plan on Free Floating so easier is better if it won't rotate.
Also, is the barrel relieved for the pins or screws?

Sean
3/28/2004 9:45:05 AM EDT
[#5]
I believe that the barrels are all relieved. I have noticed that Armalite are pinned, Eagle are clamped.
3/28/2004 4:29:12 PM EDT
[#6]
I am up in Canada.

All the preban ones up here were pinned gov't profile barrels.

When new 'postban' ones started to appear they were heavy barreled and screw on FSGB's.

The pins are easy to pop IMHO it is a cost issue with Armalite.
3/30/2004 3:28:43 AM EDT
[#7]
SinnFein,

If you are not set on Armalite I just purchased a pre-ban, mid-length chrome-lined flat-top upper from ADCO.  He shaved the barrel under the handguards so I believe it's what is called an "A2 profile".  
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