AR15.Com Archives
 Help w/ removing gas block
matai  [Member]
5/17/2009 11:52:05 PM
Hey, I'm trying to remove the gas block on my S&W M&P15OR and I just can't get it to budge. Does anybody have any tips to remove one of these?

Thanks
USMC-Helo  [Member]
5/18/2009 11:58:50 AM
Is it pinned, clamped or set screws?
matai  [Member]
5/18/2009 4:07:45 PM
Pinned
50-140  [Team Member]
5/18/2009 4:57:11 PM
Look carefully at the diameter of the pin(s), they are taper pins more than likely. You have to drive them out by hitting the smaller end. Get a fixture or some way of immobilizing the gas block and barrel. Personally I use the brownells gas block fixture, and a barrel vice.

Find the correct size punch, too small a punch will mushroom the pin, and make removal harder. Use a good size hammer, the right size punch, and start hitting it like you mean to. If it doesn't start to move after five strikes, get a bigger hammer.

In the Build it yourself thread, linked here, down the page a bit, when it gets into installing free floated forearms, there are pictures and instructions on removal of a gas block.
http://www.ar15.com/forums/topic.html?b=3&f=4&t=226782

Good luck,
Some are really easy, and some are the ultimate PITA.
matai  [Member]
5/18/2009 5:37:18 PM
Yeah, I can easily tell which side of the pin is bigger. I have it soaking in some PB Blaster right now, I couldn't find kroil anywhere locally. If that still doesn't work could I drill the pin out??
50-140  [Team Member]
5/18/2009 7:22:05 PM

Originally Posted By matai:
Yeah, I can easily tell which side of the pin is bigger. I have it soaking in some PB Blaster right now, I couldn't find kroil anywhere locally. If that still doesn't work could I drill the pin out??

Unless you have the taper drill which is used in installation of blocks, and a drill press, you will render the block useless and screw up the indentations in the barrel where the pins were.

They are taper pins, you should be able to remove them with a punch and a hammer. If you can't get the pins out, bite the bullet and bring it to a gunsmith, or gun shop.

Attempting to drill out the pins is going to make a small problem a larger one.

firefightr  [Team Member]
5/18/2009 8:02:29 PM
I think I read once that the tapers are on opposing sides (ie one going in each direction) so look out for that. Also from my limited experience you don't need to be scared about whacking the hell outta the pins just make sure you have the right size punch. Good Luck.
nolan7120  [Member]
5/18/2009 10:06:16 PM
Originally Posted By matai:
Yeah, I can easily tell which side of the pin is bigger. I have it soaking in some PB Blaster right now, I couldn't find kroil anywhere locally. If that still doesn't work could I drill the pin out??


The pins should come out on the right side of your AR, meaning you hit em' from the left.
matai  [Member]
5/19/2009 3:22:18 PM
Alright, well I got so frustrated I took my dremel with a bi-metal cutoff wheel and cut off the gas block. I did leave a couple scrapes on the barrel but nothing I can't live with especially now that it'll be covered up with a free float rail.
mousegunner58  [Team Member]
5/20/2009 2:26:01 PM
Originally Posted By matai:
Alright, well I got so frustrated I took my dremel with a bi-metal cutoff wheel and cut off the gas block. I did leave a couple scrapes on the barrel but nothing I can't live with especially now that it'll be covered up with a free float rail.


I guess that's one way to get it off.
I just try to remember to use the "lefty loosy, righty tighty" rule and apply it as loosen (remove) from the left, tighten (attach) from the right. I've read here were that doesn't necessarily apply, but I haven't seen such a case. I guess I've been lucky and haven't had any that required drastic measures, either, but I have heard here about some that just refused to budge. Usually, if the right size punch is used, a BFH will persuade them to move. But, as with anything else, I'm sure there are exceptions.
matai  [Member]
5/20/2009 6:03:50 PM
Well I'm just a single guy in an apartment so I did the best with what I had.