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 How can i remove standard handguard cap without removing fsb?
Eric__Oh  [Member]
5/16/2008 3:52:25 PM EST
This is question i'll need answering in the future when i install a longer handguard.
Is it possible for the handguard cap to be cutaway without damaging front sight base?
i haven't picked up my upper yet, so i can't tell how heavy of a metal is used in this part. Could i take a dremel to this thing? Anyone have experience with this? or better yet, pics? Link?

Any and all help appreciated.
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the_great_snag  [Team Member]
5/16/2008 4:24:39 PM EST
Um... several questions pop to mind immediately...

How would you install a longer handguard without a cap at the appropriate place to retain it? If you meant a free float tube, you would need to remove your FSB to install it anyway, unless you are doing a Daniel defense type FF tube...

Either way, handguard caps are pretty serious metal, and it's highly unlikely you could remove one without damaging your barrel, FSB, or both. I would recommend at the least that you knock out the taper pins on your FSB and slide it forward enough to get at the handguard cap with your dremel tool without risking cutting anything else.

Of course, provided you don't have a permanently attached muzzle device, why not just pull the FSB off and remove the handguard cap???
Lapp_Dance  [Team Member]
5/16/2008 4:31:18 PM EST

Originally Posted By Eric__Oh:
This is question i'll need answering in the future when i install a longer handguard.
Is it possible for the handguard cap to be cutaway without damaging front sight base?
i haven't picked up my upper yet, so i can't tell how heavy of a metal is used in this part. Could i take a dremel to this thing? Anyone have experience with this? or better yet, pics? Link?

Any and all help appreciated.


please understand, I'm not trying to be a smartass here, but you need to stop thinking about your dremel, read more of the build it yourself forum, and/or go find a competent gunsmith. there is no need to ever cut the front handguard retainer off of an AR15.
MMcfpd  [Life Member]
5/16/2008 4:46:23 PM EST
Why don't you want to remove the FSB, assuming that for some reason the handguard cap does need to come off?
Tony7189  [Team Member]
5/16/2008 7:54:55 PM EST
I ran in to this same issue and asked the same question and got no help. I bought a AR carbine with a milled gas block and permanently attached brake. I wanted to remove the endcap with out removing the brake or fsb to put on a 10" Troy free float. I never got around to doing it as I settled on a VLTOR CASV.
ORinTX  [Team Member]
5/16/2008 8:10:22 PM EST
You can just cut it away if that's the solution to your problem, but I'm not sure what the problem is.

You mention 'without damaging the front sight'.

You realize that you can remove the front sight and the endcap, and then reinstall the front sight without damaging a thing, right?

But yeah, it's been done. Guys have cut them away in order to install two piece handguards without bothering to remove the front sight. The only reason I can think of to do this is that you have a permanently attached muzzle device. Otherwise a roll pin punch, hammer, and rubber mallet makes it quite easy to get the FSB on and off.
Eric__Oh  [Member]
5/16/2008 8:45:16 PM EST
Sorrie that i didnt go into much detail in describing my situation.

First off, i have yet to lay my hands on my upper so i cant see how my gas block is mounted. YEs i said gas block, not FSB. I have the cmmg micro gas block. Why you may ask... well because ultimately i would like to have a longer 12" ff rail hand guard on the upper with the micro gas block entirely underneath. I'm hoping to get the 12" omega when(read "if") it is released from Daniel Defense.

Currently, the upper is set up with standard midlength handguards behind the micro gas block. I have ordered it in this configuration because i as of yet do not have the funds for modified ff handguards, and i'd rather not buy a cheaper one when i have my heart set on the DD omega(or lite rail if 12" omega is vaporware). I plan on keeping the standard hand guards on until both a) i have the money and b) the omega is released.

Keeping this in mind, i will later have to remove my standard handguards and install either the omega or lite rail. With the longer 12" length it will not fit into position with the larger diameter standard end cap in place. THus i have to remove. HOwever, since i have no idea how to remove the cmmg gas block yet, i was hoping the end cap could be removed without the removal of the gas block.

So to restate my original question, "Can a standard round end cap be removed without removing the fsb or gas block that is currently mounted?"

If i take a look at the gas block and it turns out to be a cinch to take it off, then this really doesn't matter. But i'm sure you can understand teh excitement i have as this is my first AR. So i was seeking the assistance from all of you that make up the vast pool of knowledge here at ar15.com.

I stated in the original post "front sight base" to keep from having to go into this much detail. i figured, "i want to remove end cap, and not remove fsb" would be sufficient to illicit suggestions. Apparently, some peopel took me to be some sort of mechanically uninclined retard. I assure this is not the case. I am more than capable of working with tools and confident in my ability to work with precision. I simply do not know what entails removing the cmmg micro gas block and a search here turned up empty.

Hopefully this answers all of the questions all your questions.

DOn't you hate it when people answer a question with a question?

MMcfpd  [Life Member]
5/16/2008 9:49:24 PM EST
That's a different situation than that of dealing with an FSB. Below are some shots of a CMMG Micro gas block:





As you can see, there are two pins securing it on the bottom, and they're not going to tap out as would FSB pins. They don't look like screws or hex nuts, but then it's 1:50 in the morning and these eyes are usually snoozin' at this time. Frankly I'm not sure how to go about removing said block. I think I'll just leave that one right where it is.

If you're waiting on an upper that you've already ordered from CMMG, you'll probably be best advised to just call them and explain what you'll be wanting to do. They've accomodated me in the past. As someone noted above, you can cut the cap off as a last resort.
ORinTX  [Team Member]
5/16/2008 9:51:27 PM EST
Those look like countersunk hex head set screws to me. Not that my vision is super awesome either.
MMcfpd  [Life Member]
5/16/2008 9:54:47 PM EST
OK, I powered up the right eyeball to full and discovered that they are in fact 5/64" hex nuts. Ought to be a little easier to remove than an FSB.

Good night now.
Eric__Oh  [Member]
5/16/2008 10:14:11 PM EST
Thanks for the helpful pics and replies fellas!

Seems it'll be easier than expected, i'll just knock out the roll pin with a punch, and use an allen key to remove the two screws to get the gas block off and then slide the end cap off. Seems pretty straight forward. Thanks.

ORinTX  [Team Member]
5/16/2008 10:22:04 PM EST

Originally Posted By Eric__Oh:
Thanks for the helpful pics and replies fellas!

Seems it'll be easier than expected, i'll just knock out the roll pin with a punch, and use an allen key to remove the two screws to get the gas block off and then slide the end cap off. Seems pretty straight forward. Thanks.



That'll pretty much do it. You may have to pull the gas tube out when you go to swap the rail, but once you pop the aforementioned roll pin and pull the gas block off, there's nothing retaining the gas tube so it doesn't add to the complexity any.
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