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Thread: Today I am chopping up my M4
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12 February 2011, 11:35 #1Contributing Member
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Today I am chopping up my M4
I just ordered a Troy MRF-MX for my LMT M4.
I'm chopping off my front sight and shaving it down to fit underneath the handguard:
I assume that when I am done, I have to trim the handguard cap?
What about the bayo lug, is that going to fit under the handguard or do I need to chop that off too?Last edited by AR-10; 12 February 2011 at 13:02.
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12 February 2011, 13:01 #2Contributing Member
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Ok I'm an idiot, that wasn't a washer it was part of the delta ring which is now gone, along with the spring and circlip - original post edited, I still haven't touched the front sight, cause I'm scurrrrrred.
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12 February 2011, 13:16 #3
Watch these videos. It should be two parts:
As far as the FSB, just cut that down and you will have to cut the sling mount and bayo lug. You should be able to leave the Handguard cap. You also have to trim abound the FSB. You'll see how much you need to trim once you have the handguard.
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12 February 2011, 13:37 #4
Well, good luck to you! I understand that one might want to chop up the FSB to fit under a hand guard. I guess this saves a little money? Or is it that a new gas block will not fit at the proper location with that particular barrel contour? Just seems like a new gas block would look cleaner. A person could always sell the FSB. I'm just wondering why folks do this. I am not being critical or anything like that. I may just be missing something I don't know about. At any rate, good luck and I hope everything goes ok for you! Can't wait to see the pictures.
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12 February 2011, 14:08 #5
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12 February 2011, 14:30 #6Contributing Member
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Great video!
Paulo is correct, my flash hider is permanently attached so I am chopping my FSB for two reasons:
1) I get a longer handguard out of it
2) I can keep my front sight out of my FOV when it's not needed
Those are two things that were really bothering me, when I'm done with this upgrade I will be a lot happier with this carbine.
Also as an added bonus: my barrel will now be free floating, my old handguard was a drop-in unit that did not FF my barrel.
Here it is, I'm not done shaving the FSB down:
I'll post a better pic after I get it painted, I'm waiting for the handguard to see how much more I have to take off.
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12 February 2011, 14:40 #7Contributing Member
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12 February 2011, 17:01 #8
Got it! I knew there was something I was missing. My rifles don't have the FSB and your explanations helped me shed some ignorance. BTW: Looks like you did a great job cutting that down. Thanks guys.
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12 February 2011, 17:06 #9Contributing Member
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No problem, here's another pic so you can see exactly what I am doing - I think I'm done for the day, I have metal all over my skin and clothes.
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12 February 2011, 17:21 #10Contributing Member
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I'm trying to shave it down like this, because this is how it has to be shaped in order to fit under a quad-rail handguard:
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12 February 2011, 17:26 #11
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12 February 2011, 18:25 #12Contributing Member
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Thanks!
That Dremel did a great job, I was surprised at how easily it cut through the FSB.
I haven't decided what to touch it up with when I'm done shaping it, I was thinking about masking off the barrel and spraying the whole section with black BBQ paint.
I figured that stuff will work since it's obviously made for high temps, it's either that or engine spray paint unless someone has a better suggestion.
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12 February 2011, 18:43 #13Distinguished Member
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Try some G96 Liquid Cold Blue for touching up the exposed steel.
http://www.g96.com/Gun_Blue.html
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12 February 2011, 20:05 #14Contributing Member
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Thanks, I may have to try some of that instead of spraying paint on my barrel.
I'm anxious to see how this all comes together, I have a T-1 and one of LaRue's new skinny mounts on the way too.
I hate waiting for new stuff!
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13 February 2011, 03:05 #15Member
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Nice job on cutting the gas block. Best part is it's still pinned. I guess a setscrew gas block is OK if under the hand guard.
You can get a tapered reamer for mating a pinned gas block to other barrels or new barrels/gas block combinations.
Think Aluma Hyde II for paint, it is bullet proof, available in rattle cans.