[ARCHIVED THREAD] - Gas block removal

Posted: 6/13/2008 2:57:32 AM EDT

Hey gang

Is there a tutorial somewhere for removing a standard FSB?
I thought I saw one somewhere but I cant remember where.

Thanx!!

P.Smith

Posted: 6/13/2008 3:15:20 AM EDT

[#1]

[...]

Now we need to remove the FSB (front sight base) from the barrel. The pins in the FSB are typically tapered. This means they can only be removed one way. (I am told that RRA and LMT use straight pins, not tapered, so those should be even easier) Look on both sides of the FSB and determine which side of the pins is the SMALLER end. It should be the left side, and we will be knocking the pins out from left to right. NOTE - Stag Arms has been shipping uppers with FSB taper pins on the opposite side of most uppers - so be sure to examine your FSB!

2. Support the barrel so that when we knock the pins out, we wont stress the barrel at all... I used a couple pieces of 2x4. Using a large diameter (~1/4") brass punch, firmly knock the pins loose. Use masking tape all round the FSB is you are worried you might slip and scratch something. I must admit... on most of the barrels I have done, a couple sharp hits with a punch knocked the pins loose.... but I finally had one Bushmaster 20" barrel that the pins absolutely would not come loose on. I ended up having to dremel the FSB down and then was able to punch them out, but I ruined the FSB. I was replacing with a flip up FSB anyway, so it wasnt a great concern... but keep this in mind, should you come across one that is not very friendly.

It will take the most force just to break the pins loose... once they are loose, we can use the small punch to tap them all the way out:

3. Now, lubricate the FSB and the area on the barrel in front of the FSB with CLP, WD40, gun oil...etc... this it to ensure we will scratch the barrel as little as possible upon removing the FSB. Wiggle the FSB back and forth to loosen it... you may need to put the barrel back in the upper receiver to hold it for this step. Then, pull the FSB from the barrel, going slow and taking care. If you go slowly, you shouldnt place any marks on the barrel from this step. Remove the barrel nut and delta ring as well:

[...]

[ARCHIVED THREAD] - Gas block removal

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[ARCHIVED THREAD] - Gas block removal

[ARCHIVED THREAD] - Gas block removal