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10/10/2007 9:52:25 AM EDT
I have an LMT Defender complete rifle (bought the upper and lower separately).  I have been wanting to do a slight rebuild of the rifle in the K.I.S.S them for a while now.  What I want to do is purchase a CMMG A1 upper and swap all of the LMT parts (barrel, etc) from the LMT upper to the CMMG.  Having not done this before, I thought I would check with the hive as to whether this would be inadvisable?  Any opinions on this?
10/10/2007 10:01:39 AM EDT
[#1]
You may have some elevation issues with the F marked FSB.

I'd just leave it a flat top and run a LaRue BUIS and leave the option for future optics myself but that's not very KISS.
10/10/2007 10:04:23 AM EDT
[#2]

Quoted:
You may have some elevation issues with the F marked FSB.


Would this also be the case with the LMT detachable carry handle?  

I really like the A1 rear sight....dang it, I hadn't thought about that F marked FSB height.  Thanks for the tip.
10/10/2007 10:07:22 AM EDT
[#3]
i wouldn't disassemble the factory LMT upper... sell it and use the money to buy a barreled CMMG A1 upper...

or just keep your eye on the EE and buy a Colt detachable carry handle...

i don't like the A1 uppers since they have two small hole apertures, and i always find myself wanting to have the flattop "just in case"...
10/10/2007 10:12:49 AM EDT
[#4]

Quoted:

Quoted:
You may have some elevation issues with the F marked FSB.


Would this also be the case with the LMT detachable carry handle?  



No. The higher F marked FSB is for flat top service and designed for use with the detachable carry handle.
10/10/2007 10:16:52 AM EDT
[#5]
Thanks guys.
10/10/2007 12:18:36 PM EDT
[#6]
Wouldn't using a non "F" marked FSB solve the problem of using an A1 receiver??
10/10/2007 12:27:24 PM EDT
[#7]

Quoted:
Wouldn't using a non "F" marked FSB solve the problem of using an A1 receiver??

Yes but...

Not really a good option because its very difficult to install a new FSB on a barrel that is already cut for one. In fact I don't know if it is other then a clamp on type.

The simple solution is a shorter sight post.
10/10/2007 1:29:37 PM EDT
[#8]

Quoted:

Quoted:
Wouldn't using a non "F" marked FSB solve the problem of using an A1 receiver??

Yes but...

Not really a good option because its very difficult to install a new FSB on a barrel that is already cut for one. In fact I don't know if it is other then a clamp on type.

The simple solution is a shorter sight post.


I have heard that about swithing the FSB, yet a number of people around here seem to do it, as well as barrels sold on the EE without a FSB.

Thought of using a shorter sight post as well.  I know that BM provides a longer one, but does anyone sell a shorter version; or do you have to have a satndard one milled down??
10/10/2007 4:49:17 PM EDT
[#9]

Quoted:

Quoted:

Quoted:
Wouldn't using a non "F" marked FSB solve the problem of using an A1 receiver??

Yes but...

Not really a good option because its very difficult to install a new FSB on a barrel that is already cut for one. In fact I don't know if it is other then a clamp on type.

The simple solution is a shorter sight post.


I have heard that about swithing the FSB, yet a number of people around here seem to do it, as well as barrels sold on the EE without a FSB.

Thought of using a shorter sight post as well.  I know that BM provides a longer one, but does anyone sell a shorter version; or do you have to have a satndard one milled down??


Good question on the sight post, I don't know, I've never looked. I know they make taller posts.

I've installed FSB's on barrels that have not been cut for them prior as well. I used a laser to align and a mini mill to drill the holes.
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