Posted: 10/25/2008 7:38:43 AM EDT
| Hey guys, I really considering starting my first major modifiction. I have a Bushy HBAR with a stardard A2 front tower and handgaurd. After reading about them and listing to a feel people talk about how relativiely easy it is to do, I'm thinking of going to a free floating guard. Now I figure if I'm gonna do that I'm gonna go with something that covers the gas block too. So obviously I'm in need of a low profile gas block. I'm looking at the Larue rails, pretty sweet. While I'm shopping there, I figure I'll pick up the block from them as well. Here's the thing, it uses set screws as opposed retainer pins on the A2 (I realize this is more or less par for the course on low proflie blocks.) However it says that it needs divots to mount and barrels w/o divots will require gunsmithing. I have yet to remove the sight tower, is there any chance these divots are already there? Anyone have any expirence with these barrels and/or blocks? |
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The dimples will not be there. Any decent gunsmith can perform the work for you. Another cheaper option would be to shave off the front sight base. I did it on Bushy HBAR once and then put a long rail over the top. It took less than 30minutes to complete the process including painting it when done. I think it will be a sturdier method as compared to dimpling a barrel. |
| Even if it does use pins, the chances of them being in exactly the right place is pretty damn slim. That is why so many of us just cut down the origional FSB, you don't have to mess with pin locating, drilling the dimples, etc, its already been fitted. A little time with a dremel, quick shot of paint, and you're good to go. Once its covered with the FF, it'll never be seen, so what does it matter who made it, you already know it works with your rifle. |
| i got a yhm 4 rail gas block on my pistol with no dimples in the barrel and have never had a problem with it. it stays tight and i never have to worry about it. should be the same for you. u just have to make sure it is lined up level so the gas block and the gas port are lined up. |
| If you can use a drill, you can dimple the underside of your barrel for the setscrews. Ranier Arms (site sponsor/vendor) sells a jig ( http://www.rainierarms.com/?page=shop/detail&product_id=1089 ) that was developed by another board member for locating the dimples that makes it foolproof. It's a little pricey for doing just one barrel, but you never know when you or a buddy might want to do another one. There's lots of ways to get the job done, but this takes all of the guesswork out of it. I used one to mount a Larue block on my barrel and I can attest to the efficiency and accuracy of this jig. FWIW |
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Quoted:
If you can use a drill, you can dimple the underside of your barrel for the setscrews. Ranier Arms (site sponsor/vendor) sells a jig ( http://www.rainierarms.com/?page=shop/detail&product_id=1089 ) that was developed by another board member for locating the dimples that makes it foolproof. It's a little pricey for doing just one barrel, but you never know when you or a buddy might want to do another one. There's lots of ways to get the job done, but this takes all of the guesswork out of it. I used one to mount a Larue block on my barrel and I can attest to the efficiency and accuracy of this jig. FWIW That was me. 
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That was you and I followed the original thread closely. Picked up a jig from Ranier and used it when I installed a Larue block on my Sabre barrel. The jig works slick as a whistle and elimnates all of the guess work. I thought about selling mine when I was finished, but decided to keep it for future, as-yet-undetermined builds and/or modifications.
My compliments for the ingenuity to come up with something so simple yet functional and for the wherewithall to see it through from inception to market. 
Dave |
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When I installed my LaRue 13.2 handguard and Larue Gas Block on my 20" Government Profile barrel, I dimpled it myself.
Here is how I did it, and it worked great. - Remove FSB. - Install gas block with only one set screw. - Put a tiny bit of white paint on the tip of the other set screw. - Install painted set screw. - Remove the first set screw. - Put tiny bit of white paint on tip of set screw. - Install set screw. - Remove set screws. - Remove gas block. - Put barrel in barrel vise block in drill press vise. - Dimple the center of the white dots left by the paint. - Install gas block. - Loctite set screws. - Install set screw. - Reassemble upper. It worked perfectly. Here it is 
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Quoted:
When I installed my LaRue 13.2 handguard and Larue Gas Block on my 20" Government Profile barrel, I dimpled it myself. Here is how I did it, and it worked great. - Remove FSB. - Install gas block with only one set screw. - Put a tiny bit of white paint on the tip of the other set screw. - Install painted set screw. - Remove the first set screw. - Put tiny bit of white paint on tip of set screw. - Install set screw. - Remove set screws. - Remove gas block. - Put barrel in barrel vise block in drill press vise. - Dimple the center of the white dots left by the paint. - Install gas block. - Loctite set screws. - Install set screw. - Reassemble upper. It worked perfectly. Here it is http://i139.photobucket.com/albums/q287/nicholsmf/CMMG.jpg That's basically how I did most of my builds. The last few used the jig I designed. The jig isn't needed but it makes the job easy and dead nuts on. |
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Quoted:
That was you and I followed the original thread closely. Picked up a jig from Ranier and used it when I installed a Larue block on my Sabre barrel. The jig works slick as a whistle and elimnates all of the guess work. I thought about selling mine when I was finished, but decided to keep it for future, as-yet-undetermined builds and/or modifications. My compliments for the ingenuity to come up with something so simple yet functional and for the wherewithall to see it through from inception to market.
Dave Thanks man! 
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Quoted:
When I installed my LaRue 13.2 handguard and Larue Gas Block on my 20" Government Profile barrel, I dimpled it myself. Here is how I did it, and it worked great. - Remove FSB. - Install gas block with only one set screw. - Put a tiny bit of white paint on the tip of the other set screw. - Install painted set screw. - Remove the first set screw. - Put tiny bit of white paint on tip of set screw. - Install set screw. - Remove set screws. - Remove gas block. - Put barrel in barrel vise block in drill press vise. - Dimple the center of the white dots left by the paint. - Install gas block. - Loctite set screws. - Install set screw. - Reassemble upper. It worked perfectly. Here it is http://i139.photobucket.com/albums/q287/nicholsmf/CMMG.jpg This is how I installed my LaRue gas block. I used an 11/64" HS bit in a Makita and drilled until the divot just matched diameter of the drill bit. You'll be surprised you fast you get it done & how soft the barrel steel actually is. Just make sure you are square before you apply pressure to the drill. Good Luck! Jeff |