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Started By
Message
Bravo Company KMR rail system
Posted on 4/25/14 at 10:26 pm
Posted on 4/25/14 at 10:26 pm
Feel free to move this to the AR thread...
I want to buy the BCM KMR-13 keymod rail set up. I have a colt 6920, but I need to buy a new gas block and remove the front stock iron sight. I can't really seem to dig up the literature on exactly what type of gas block I need to buy to make this fit my rifle. Any thoughts?
I want to buy the BCM KMR-13 keymod rail set up. I have a colt 6920, but I need to buy a new gas block and remove the front stock iron sight. I can't really seem to dig up the literature on exactly what type of gas block I need to buy to make this fit my rifle. Any thoughts?
3
Posted on 4/25/14 at 10:33 pm to m2pro
Any "lo pro" or low profile gas block should work 
Posted on 4/25/14 at 10:38 pm to m2pro
Just cut the sight post, save money and more secure according to some.
Posted on 4/25/14 at 10:53 pm to tiddlesmcdiddles
Roger that! Thx to the second guy's post too. both are actually damn helpful considering the probable lack of responses here. 
Posted on 4/25/14 at 10:55 pm to burgeman
quote:
Just cut the sight post, save money and more secure according to some.
I usually just shave the fsp as well, much more secure option. You'll have to dimple the barrel if u want to properly install a lo pro gas block.
Posted on 4/25/14 at 11:00 pm to chrisman17
quote:
I usually just shave the fsp as well, much more secure option. You'll have to dimple the barrel if u want to properly install a lo pro gas block.
well shite. i don't want to keep my front fixed iron, but i also don't want to dremel that shite off. i want a flip sight so it doesn't interfere with my magnifier. :(
Posted on 4/25/14 at 11:01 pm to m2pro
Just get a low profile gas block. Chopping the front sight just means you are left with a piece of junk. That rail will cover the gas block completely so it's not like you have to worry about it taking a hit and shifting over the gas port causing a malfunction. Even that is not much of an issue with exposed, bolt-on gas blocks that are installed properly.
Posted on 4/25/14 at 11:05 pm to m2pro
quote:
well shite. i don't want to keep my front fixed iron, but i also don't want to dremel that shite off. i want a flip sight so it doesn't interfere with my magnifier. :(
Look up shaving a front sight on YouTube, it's super easy and looks good.
Posted on 4/25/14 at 11:31 pm to m2pro
quote:
well shite. i don't want to keep my front fixed iron, but i also don't want to dremel that shite off. i want a flip sight so it doesn't interfere with my magnifier. :(
Well you are going to have a few problems then. KMR-13 on a carbine means the handguard is going to be well past the gas block. A folding front sight will do absolutely no good there. So you'll be stuck with same-plane BUIS options that can fold down with an optic.
Posted on 4/26/14 at 8:48 am to m2pro
quote:
i don't want to keep my front fixed iron, but i also don't want to dremel that shite off.
Then get the lo-pro gas block. Personally have had a couple shaved down by a professional and it looks good, but you can't have it and flip sights.
quote:
i want a flip sight so it doesn't interfere with my magnifier. :(
Are you talking about front and rear flip up sights now? A fixed front sight post wont really interfere with a red dot and magnifier.
Posted on 4/27/14 at 1:12 pm to RATeamWannabe
quote:
Are you talking about front and rear flip up sights now? A fixed front sight post wont really interfere with a red dot and magnifier.
Sorry to bump from 2 pages back, but yeah I am going to get a front flip sight to put on the end of my rail, and already have the rear flip sight. my question now is mostly concerning whether i want to shave down my front fixed instead of replacing the gas block.
i think i'm going to go with shaving it down, in spite of it feeling un-natural to ruin a piece of equipment... i want to protect that metal tube you have to bend (i guess attached to the gas block). i have also now seen one that was shaved down very effectively and it looked fine.
what are y'all's thoughts on replacing the crush washer under the flash suppressor instead of just reusing it, AND what are y'all's thoughts on -not- using a torque wrench when putting on the nut at the base of the barrel to make it a free floating barrel?
i myself am pretty conservative thinking and want to buy another crush washer and i suppose buy the right wrench to put the exact torque specs listed.
Posted on 4/27/14 at 1:25 pm to m2pro
What metal tube are you bending?? The gas tube? Why are you bending that? Am I missing something?
Posted on 4/27/14 at 1:32 pm to RATeamWannabe
quote:
RATeamWannabe
You're going to have to fully excuse my horrible newness to this all. I was commenting on this quote from earlier..
quote:
You'll have to dimple the barrel if u want to properly install a lo pro gas block.
I combined that statement with a youtube video I saw where a guy was putting on a new DD rail system. when i saw the video, the gas tube had what looked like a bend in it that almost seemed done by him. I would have expected it to look straight, in other words.
However, I just watched a portion of another YT video and learned the "why not" to use a low profile gas block. so now, I think i'm getting close to understanding it a bit better!
Posted on 4/27/14 at 1:37 pm to m2pro
Crush washers are NOT reusable. Just FYI. This thread is confusing a little.
Posted on 4/27/14 at 1:39 pm to LSUmakemewanna
quote:
Crush washers are NOT reusable. Just FYI. This thread is confusing a little.
Yeah, that's my bad. I was under that impression as well about the crush washers. Dude, sorry about the confusion. I'm only now really getting into modding my first one with a rail system. I want to be gd positive I'm doing stuff right, and I don't know where to begin. so i just started off here since it's the only forum i actually post on from time to time.
Posted on 4/27/14 at 1:43 pm to m2pro
No worries. I was just confused a little reading through here. Don't hesitate asking anything. There are a lot of people here with a good working knowledge.
With regards to the "why not to use a low pro gb", there are definitely folks out there who will not deviate from the dimpled fsp. Can't fault them for going with something that's proven to work. That being said, as others have stated in this thread, low pros are gtg if installed properly (dimpled).
With regards to the "why not to use a low pro gb", there are definitely folks out there who will not deviate from the dimpled fsp. Can't fault them for going with something that's proven to work. That being said, as others have stated in this thread, low pros are gtg if installed properly (dimpled).
Posted on 4/27/14 at 1:52 pm to LSUmakemewanna
roger that.
while i have you here... any reasons that i shouldn't go with a 13" rail system OR any reason to go with someone other than BCM?
i dig that it's light weight. i'm a smaller guy, and it's aluminum/magnesium alloy. so nearly as strong as full metal. 7.5 oz or so. i'm also digging the idea of keymod, just sort of concerned in terms of a compatibility standpoint. for example, if i go with a keymod system, am I going to be limited to a handful of lights, grips, or just attachments in general?
while i have you here... any reasons that i shouldn't go with a 13" rail system OR any reason to go with someone other than BCM?
i dig that it's light weight. i'm a smaller guy, and it's aluminum/magnesium alloy. so nearly as strong as full metal. 7.5 oz or so. i'm also digging the idea of keymod, just sort of concerned in terms of a compatibility standpoint. for example, if i go with a keymod system, am I going to be limited to a handful of lights, grips, or just attachments in general?
Posted on 4/27/14 at 1:58 pm to m2pro
Posted on 4/27/14 at 2:01 pm to burgeman
NICE links! Man, there are so many god damn rail systems to choose from. All I'm sure of is that I want it to be strong and light weight. I'm PRETTY sure I want a longer length rail system even if it's a few bucks more because it will allow me more options for placement. keymod itself has ways to move stuff at more than just the major placements of 12, 3, 6, 9!
Posted on 4/27/14 at 5:41 pm to m2pro
quote:
AND what are y'all's thoughts on -not- using a torque wrench when putting on the nut at the base of the barrel to make it a free floating barrel?
I think the people who don't use the proper tools and fixtures when working on firearms are retards and deserve whatever they get if something blows up in their face.
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