AR Sponsor
Posted: 2/11/2010 11:33:59 AM EDT
|
Looking at putting together my first sbr.
how easy is it to remove the big triangle shaped fsb so i can put in a low profile gas block in its place? Thanks |
|
Quoted:
Looking at putting together my first sbr. how easy is it to remove the big triangle shaped fsb so i can put in a low profile gas block in its place? Thanks Very easy. Measure the pins and find the smaller ends of the pins (they should be tapered). Knock out from the small end with a punch (I've even used a nail when I didnt have a punch). The small end should be on the left side of the weapon as looking down the barrel when shouldered. Some FSBs dont have tapered pins. If this is the case with yours, knock them out from either side. |
|
Quoted:
read the post above this one 
or take a dremel to it. instead of buying a low pro gas block i just cut my front sight block to fit under the dpms float tube. works great. chop it off, smooth it up, paint it black. 20 minutes & done I just accomplished this yesterday actually. Its already hidden by a 10" rail now or I'd post pics. I can give the OP some advice on that as well if they want it.....theres a tutorial in the "Build it yourself" sub-forum about it. |
|
they can be a bear depending on the manufacturer. Sabre and BCM pins are notoriously difficult to get out.
Here is the story of my battle with them. Some good info in there and other threads for pointers. Click HERE Before that SD build, I had removed FSB taper pins many times with not problems. Just have the right tools and it shouldn't be too difficult. |
|
Quoted:
Is it absolutely necessary to have that brownells fsb removal block tool to get the pins out? If not then suggestions about how I should clamp the barrel etc would be appreciated. It's not necessary at all. I've done it a few times now and I didn't even know you could get a specific tool for the job. You need a hammer and a punch. I just supported the fsb and barrel with a few pieces of wood. A few sharp taps on the small end of the pins and they came out with no problems. Also, if you are going to be covering the gas block with a free float rail then cutting down the original FSB is a really good way to go. You can't re-use it on another rifle anyway and you will end up with a pinned gas block that is going to be much more solid than any aftermarket low-profile gas block. |
|
I usually support the FSB with a block of wood.......its always good to have a helper to keep the work steady........I use short and stocky pin punch.......shortened and I will cup the end that comes in contact with the pin with a dremel.......this helps
Keep in mind......when striking the pin.....small end, don't tap, tap, tap, have a decent hammer and give it a strong hit......... |
|
Quoted:
Is it absolutely necessary to have that brownells fsb removal block tool to get the pins out? If not then suggestions about how I should clamp the barrel etc would be appreciated. Not "absolutely necessary" to have THAT tool. But you MUST have the FSB AND THE REST OF THE BARREL fully and securely supported. Not only will you spend a lot of time catching stuff that slips off the bench and cussing, you can damage the barrel and/or the upper if you don't keep everything VERY solidly secured. BCM recommends using a punch LARGER than the small end of their taper pins to break them loose (it's much harder to have a big punch skitter across both the FSB and barrel) and then push the pins the rest of the way out with a punch that's smaller than the small end. Instead of that, I would use an arbor press to break the pins loose. In any case, you MUST have somewhere for those pins to go before you start hammering on them. |
AR Sponsor