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Posted: 4/23/2013 11:57:43 AM EDT
| I am going to cut off the FSB so I can put on a FF handguard. My question is do you remove the FSB to cut it or do you just leave it on and cut it in place? I have heard both ways, and it really does not matter to me. Just seems like it would be just as easy to leave it on and trim it up. What say you. |
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I've done it that way to a bushy and a colt. I just cut it off flush with the top of the tube that the gas tube goes into, then trimmed the ears a bit. Easy. Yeah, I have no plans to perfectly shape it like a low profile gas block. Just want to take off enough material to make the handguard go on without snagging, polish the edges a bit to make it look decent. Apply some Permablue and done. |
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Just don't nick the barrel... x2 I just cut the fsb off my bcm. Super easy! I barely nicked the barrel, and learned pretty quick to tape the barrel with some duct tape in case the dremel slips! Good advice. I planed on covering the barrel and upper receiver just to keep shavings and crap from getting all over it. The duck tape is a good idea though. |
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Please forgive me, but is the $25 for a low-pro gas block such a stretch that the Dremel surgery is justified? I mean, I know it's always fashionable to save money, and there's a certain "rush" to finding a work-around, but really.... The FSB is in place and it's pinned. No need to take away something you KNOW works. |
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Please forgive me, but is the $25 for a low-pro gas block such a stretch that the Dremel surgery is justified? I mean, I know it's always fashionable to save money, and there's a certain "rush" to finding a work-around, but really.... The FSB is in place and it's pinned. No need to take away something you KNOW works. Pretty much this. The pinned part is what made me do it over a clamp/screw in. Plus it only take about twenty minutes including removal time if you go that route. Here's the one I did. 
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I would take it off if you have the tools.
I did mine on the barrel on my first AR because I did not have the tools. (FSB bench Block ect...) The handguard cap was the most difficult to get off because you cant cut it all the way since its up against the shoulder on the barrel. You have to cut it as close as you can then twist it off with pliers or something. Removing the FSB would make that easier and its just easier to work on it when its off. And for the person who asked why not just use a low pro GB, the FSB is the sturdiest setup available. It is the most durable option, and happens to be free. |
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I cut my first FSP recently after reading up on the subject here. I left it on the barrel and went to town with reinforced cutting wheels and sanding drums. If I were to do it over again Id still leave it on the barrel...it was easy to do and taking it off would've taken considerably more time and I don't see how it would've benefitted me much.
One suggestion, make sure to wear safety goggles AND a dust mask. I skipped the mask and was blowing out black boogers for days  ....I could also taste the steel every time I coughed or cleared my throat. Next time Ill be wearing a mask that's for sure!!
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OP what FF Rail ya going to with?? Ha! Just saw your screen name. HOTTY TODDY! Ole Miss, class of 1994. Small world. I am going with the Samson 11" Evolution FF Tube. 
Debated between Troy, Yankee Hill, and Midwest Industries, liked this one the best. I had a Magpul midlength handguard, but I am changing my optic to a Leupold Mark AR and putting on 45 degree BUIS. FF tube best meets these needs, plus I just like them better. |
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You can do it either way, but its easier if you take it off. When I did mine, I left it on to cut and eventually had to take it off bc the HG cap wasnt cooperating. Way easier if I had just taken it off in the first place. Just cut the cap off. Lol, that's what I mean by not cooperating. I cut a line on both sides as deep as I could and it just wouldn't give. Anyway if possible, make your life easier and take it off. On a related note, I wish I didn't chop only bc i took the rail and upper for another gun and now I have to buy a new rail or go ugly "optics ready" style |
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If only someone did a step by step on this.
http://www.ar15.com/forums/t_3_4/226782_Assemble_your_own_LOWER__UPPER__FREE_FLOAT__TRIGGER__GAS_BLOCK___Step_by_step_instructions_.html |
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