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Posted: 2/14/2006 5:27:44 PM EDT
Hey guys,
I had major problems trying to install one of these type swivel mounts that a lot of people sell:

What happens is I can't fit it between my FSB and barrel on my bushmaster M4 without having to pound the ends flat to slip it under the FSB.

Now I see brownells has this one:
The end looks way different so I was wandering if this is a misprint or that is how they are.

Can anyone take some close up pics of the swivel mount and let me know which "factory" colt one they have.  For all I know they can have the same type of lips that I will still have a problem.

My barrel is the M4 profile which I believe is the .750 size under the FSB.

Link Posted: 2/14/2006 5:39:26 PM EDT
Beware if ordering the one from Brownell's.  The unit comes completely disassembled meaning the sling loop isn't riveted to the mount.

I have run both the Colt and RRA units on my Colts and they work perfectly.  You may have a tolerance issue with the space between the FSB and the barrel.  Bushy isn't known to mind the details too much.
Link Posted: 2/14/2006 5:43:12 PM EDT
OK I just looked at the RRA and it looks like it only fits one size barrel but doesn't say which?


Any ideas???
Link Posted: 2/14/2006 5:48:27 PM EDT
It fits standard heavy barrels (.750").  Incidentally, the Colt and RRA units carry the same part number and look virtually identical.  I get mine here.
Link Posted: 2/14/2006 5:52:13 PM EDT
Funny I don't see them listed under sling mounts???

Forget it, I found them.  I guess it is worth a shot to try it.  You don't happen to have any pictures of yours do you?
Link Posted: 2/14/2006 5:58:47 PM EDT
This is the only pic I have.

Link Posted: 2/14/2006 6:01:44 PM EDT
Ya not the side I am looking for.  Thanks anyway.
Link Posted: 2/14/2006 6:32:25 PM EDT

Ya not the side I am looking for.  Thanks anyway.

I found a pic of the other side.  Check it out now.
Link Posted: 2/15/2006 3:19:46 AM EDT
I am going to try the RRA mount and see if that works.

Link Posted: 2/15/2006 3:32:44 AM EDT
The RRA and the Colt are identical.  If you're having trouble then it has something to do with your tolerances on your front sight or your installation method.  Perhaps you could post a pic of the problem you're having.
Link Posted: 2/15/2006 4:01:01 AM EDT
The Bushmaster product.

Link Posted: 2/15/2006 4:02:14 AM EDT
I just ordered the RRA mount, so if I have problems with that I will post pics and let you know.
It looks like I only have a 2-3mm gap between the FSB and the barrel.

Hopefully by the weekend I will have the part.
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