Sorry about that Damian :o
Thanks for the info! 
Jeff,
I was kind of surprised to see the hijack since I thought that issue had already been discussed to death on several other forums. It happens though.:rolleyes:
As for CMT, I keep hearing they supply for Colt but I have not found absolute confirmation of what exact parts they supply if at all. When I asked about it at the Colt armorer class earlier this month, the instructor said he has never heard of CMT and Colt makes all of it’s parts except the magazines. Of course had had only just found out about the LE1020 so I’m not sure how connected he is with anything other than teaching the basic class. I asked Stag about it at Shot and they just smiled and said they couldn’t talk about it. When I hear issues with CMT bolts not being staked properly, I start to wonder.
I think Bushmaster’s are OK for a fun gun, but after the problems we’ve had with out patrol rifles, I’m not planning on ever using one for work (I still have one as a spare). I’ve heard good things about the BCM but just haven’t seen enough people who can say they’ve given it the ultimate test. I know there are people saying good things about it now, but look at how many people still think Bushmasters are better quality than Colt. At least with the LMT, I can talk to enough people that I trust to say that they are reliable with a Colt lower and they trust it to work with their lives.
Ultimately I would like to stick with all Colt but they don’t currently make the barrel that I want and cost becomes a real issue.
As for the suppresors, I briefly spoke with Kel about the HALO and he said people are using the LMT’s and having success but you need to be careful about what ammo you use. One intersting note he mentioned is to use a later model LMT barrel as the early ones were machined differently and the HALO wouldn’t fit properly.
KevinB, thanks for replying. The last two shootings in my department were both in very close proximity to vehicles. I’ve have a few close calls and they’ve all been within 5 - 15 feet.
AFAIK, Gemtech is the only company that puts in in writing to NOT install on anything shorther than 11.5" barrels. I know AAC and OPS INC work great on barrels as short as 7". (There is a large PD out west that dumped their MP5s for 7" ARs w/15th model OPS INC suppressors)
There is the possibility of stabilization issues, but most of them come from mag dumps. I know of no “professional” ever needing numerous mag dumps to stop a threat. The yahoos who like to spend ammo on full auto at places like Knob Creek, will destroy most any suppressor on a SBR.
The first baffle gets blasted will all that pressure and unburnt powder, its life span is cut way short. If you want a suppressor on a short SBR, I believe the OPS MBS is the ONLY way to go. The brunt of the blast/abuse is absorbed by the muzzle brake, and not a baffle inside the suppressor.
Maybe I missed it, but what barrel do you want that Colt doesn’t make?
I was looking for an 11.5 in a heavier barrel. I’ve only seen the lightweight R0933/6933 barrels. I was thinking of having SAW cut a barrel from another upper but cost really starts to become an issue.
in case you dont check this forum often
https://www.m4carbine.net/showthread.php?t=819
I shot a class with a guy who ran an LE6921 with an 11 inch barrel he said that the M4 cut was in the way of making it an 11.5. Elmore did the work.
I am looking into a 12.5 inch barrel for a SF can right now.
He should have had someone else do the work. Theres no problem with the cut if you want to cut a 14.5" down to 11.5".
Very interesting topic!
So its best to avoid anything shorter than a 11.5 bbl on SBR when using a suppressor.
Good to know.
I would go down to as short as 10 inches as a rule.
I run a Novekse 12" with the HALO on almost all the “time”, and about 50% of the rounds fired. It is removed for high-intensity training due to the thermal issues USMC03 discussed. The gun does get dry and dirty a lot faster with the can, but there has not been a reliability impact yet. I attribute this to a good build by John.
For the overall size of the weapon, think of it as a “quiet” SPR-- since it’s a similar length and weight to the 18" SPR (without the OPS can obviously).
For what you were referring to, it was a great post.
Im leaning towards a LMT 10.5 upper for my next build ( 1st SBR ) .
lower= STAG (like every other AR Ive built)
Upper = Im leaning towards a LMT 10.5
Stock = Looking to try out a Magpul CTR (only magpul product ive got are MIAD)
BUIS = Larue (gotta keep it simple)
Rail = at a later point 
GRIP = MIAD
But the thing that has me scratching my head is would a Gem tech HALO work on such a short barrel? Reason being is I have 4 other’s with A2 FH’s and Id like to have a suppresor that can be whored from one to another.
Gemtech is a fantastic company and I bet if you called them up they’d be more than happy to discuss it with you.
Wow, what a necro-post. Oh well, here’s an update. I have an LMT 10.5 and my form 4 went pending last week on a G5. I’ll let you know how it works out when I get everything set up.
Well looks like I got my answer about the HALO and SBR’s from Gem-Tech .
[b]Sent: Sunday, January 21, 2007 3:50 PM
To: techstaff@ gem-tech.com
Subject: HALO suppressor ( mounting on sbr )Whats the shortest recommended AR-15 barrel length that a HALO may be mounted to?
The LMT 10.5 should be fine. Make sure it has the M4 type step-down so the HALO collar will go over the barrel. The early LMTs had no reduced-diameter behind the muzzle, and that caused interference with the closer. Other than that, many government clients are running HALOs on LMT 10.5s successfully.
We hope this has been responsive to your inquiry.Thanks,
[/b]
Guess that answer’s that question for me.
I also recommend not running a crush or peel washer if you can help it, with the HALO. I have seen two HALOs that got baffle strikes because the HALO collar was misaligned due to the waster. My Noveske SBR has the A2 timed directly to the barrel shoulder.