View Full Version : FSB alignment jig - pics inside
The FSB jig prototype lives. This is one I have been thinking about for a long time and finally got it into CAD and had one made. I already have a few changes I want to make but nothing major. It may work with clamp on sights as well, depends on if the 5/16" key stock would fit.
Barrel started out as a RRA heavy with no FSB. I had it turned down to 0.800" under the handguards and did the F marked FSB install pictured below.
http://img.photobucket.com/albums/v224/comp1911/Guns/gas%20block%20jig/IMG_2679.jpg
http://img.photobucket.com/albums/v224/comp1911/Guns/gas%20block%20jig/IMG_2680.jpg
http://img.photobucket.com/albums/v224/comp1911/Guns/gas%20block%20jig/IMG_2663.jpg
http://img.photobucket.com/albums/v224/comp1911/Guns/gas%20block%20jig/IMG_2665.jpg
http://img.photobucket.com/albums/v224/comp1911/Guns/gas%20block%20jig/IMG_2666.jpg
http://img.photobucket.com/albums/v224/comp1911/Guns/gas%20block%20jig/IMG_2667.jpg
http://img.photobucket.com/albums/v224/comp1911/Guns/gas%20block%20jig/IMG_2668.jpg
http://img.photobucket.com/albums/v224/comp1911/Guns/gas%20block%20jig/IMG_2670.jpg
http://img.photobucket.com/albums/v224/comp1911/Guns/gas%20block%20jig/IMG_2672.jpg
http://img.photobucket.com/albums/v224/comp1911/Guns/gas%20block%20jig/IMG_2674.jpg
http://img.photobucket.com/albums/v224/comp1911/Guns/gas%20block%20jig/IMG_2677.jpg
http://img.photobucket.com/albums/v224/comp1911/Guns/gas%20block%20jig/IMG_2678.jpg
MarshallDodge
02-20-09, 09:05
Very nice!
I need a mini-mill!! :cool:
Pretty slick setup. Any plans on selling them, or providing the service?
Pretty slick setup. Any plans on selling them, or providing the service?
I need to get pricing from the shop. I hope to be able to offer these for sale.
SpaceGhost
02-20-09, 17:18
Sweet, work out some pricing and let me know. I'd be interested.
Excellent set up, nice job.
navyretired1
02-22-09, 02:30
That is very slick. do you power ream 2/0 after drilling. I use a simular rig made from white oak but keys from receiver instead barrel pin, very cool. I'm starting work in the morning on new one, hope you don't mind as they say it's a compliment.
That is very slick. do you power ream 2/0 after drilling. I use a simular rig made from white oak but keys from receiver instead barrel pin, very cool. I'm starting work in the morning on new one, hope you don't mind as they say it's a compliment.
I wish I had a big mill so I could make them myself. I have to sub most of this stuff out to shops that have the equipment. My mini mill could probably do these, I'll probably try to do one one of these days.
I do power ream with the mini mill at a low speed and lube. I do the final fitting by hand though.
Here is some constructive advice to improve your set up.
That square bar which goes between the block and FSB post hole should be atleast twice as thick so there is no chance of it flexing.
You also need to devise some type of spacer to put under the square bar to compensate for a 0.040" difference in a F marked FSB so your jig can be used for both FSBs.
-OR-
I would mill down one side the square bar and have it be flippable to compensate for a F marked FSB.
Here is some constructive advice to improve your set up.
That square bar which goes between the block and FSB post hole should be atleast twice as thick so there is no chance of it flexing.
You also need to devise some type of spacer to put under the square bar to compensate for a 0.040" difference in a F marked FSB so your jig can be used for both FSBs.
-OR-
I would mill down one side the square bar and have it be flippable to compensate for a F marked FSB.
Thanks for the feedback.
a308garand
02-23-09, 16:50
Very nice work. You must post an update on how well the rifle shoots and if it needed much windage dialed in :)
BravoCompanyUSA
02-23-09, 22:32
Wow, very very very nice job!!
I think that product would sell.
BravoCompanyUSA
02-23-09, 22:34
PS: Cool mousepad !:D
PS: Cool mousepad !:D
Works as a work pad too. :D
Thanks for the F marked FSB's got one yesterday along with a Vltor gas block for this project: https://www.m4carbine.net/showthread.php?p=317054#post317054
Very good!
C4
Thanks Grant.
For hobby use, why can’t you just tap a set screw on the bottom hole and use the barrel dimpler jig? I figure it would work just as well as any low profile gas block with a bottom set screw set up.
For hobby use, why can’t you just tap a set screw on the bottom hole and use the barrel dimpler jig? I figure it would work just as well as any low profile gas block with a bottom set screw set up.
I thought that too but found that the hole isn't in always in the same location or the right location for that matter.
Thanks, you just saved me a big head ache. By the way any ETA on your gas block taper pin jig ?
I was thinking about the opportunity for flex too. That's an awful long span to control flex. I would also be concerned about the clamping method slipping. Not knocking your setup, it is FAR above most home garage setups (ie hand drill and a coors light) but that would be my concerns from having some machinist background.
......
Not sure I see how you guaranteed that the barrel was perfectly parallel with the table/vise and perpendicular to the axis of the end mill/quill. Nothing is referenced off or to the fixture. Looks like the barrel could be easily rotated in the vise unless you spent a lot of time indicating it in.
Not sure I see how you guaranteed that the barrel was perfectly parallel with the table/vise and perpendicular to the axis of the end mill/quill. Nothing is referenced off or to the fixture. Looks like the barrel could be easily rotated in the vise unless you spent a lot of time indicating it in.
That's not the point of the jig. But if I had more table you could use the jig to set up. The point of the jig is to align the FSB. Sure the key stock can flex a little but when it's bolted down to the FSB it gets more rigid.
I don't think the drilling will move it but you can set screw the FSB to prevent rotation. The reason for the 5/16 keystock is that's what fits the FSB, its cheap and cheap to machine.
I just squared the barrel to the drill and lined up with the FSB by eye. No magic here. Theres a few ways to do this set up.
Thanks for the comments.
Thanks, you just saved me a big head ache. By the way any ETA on your gas block taper pin jig ?
The Vltor drilling jig should be available in the next two weeks.
Robb Jensen
02-27-09, 07:43
Very slick. I like both things you've designed.
I beefed up the FSB jig to minimize flex.
http://img.photobucket.com/albums/v224/comp1911/Guns/gas%20block%20jig/IMG_2689.jpg
http://img.photobucket.com/albums/v224/comp1911/Guns/gas%20block%20jig/IMG_2690.jpg
http://img.photobucket.com/albums/v224/comp1911/Guns/gas%20block%20jig/IMG_2692.jpg
Greenrifle
03-04-09, 21:45
Not that I need one;), vary nice.
exkc135driver
03-05-09, 11:51
FWIW -- I'm no machinist -- I think the beefed up version is much better.
Ghostface03
03-05-09, 12:51
Quite the handyman.
FWIW -- I'm no machinist -- I think the beefed up version is much better.
It has no side to side movement which is what you want. The original with just the key stock worked fine but you needed to be careful. This one is not going to move.
If these go into production, they will look much better then my "machining".
I may have the top plate waterjet cut to reduce machining costs as well. Onward!
Greenrifle
04-27-09, 01:46
Any chance of these becoming available?
spamsammich
04-27-09, 11:33
tagged for updates.
Any chance of these becoming available?
I hope so. I'm hoping I can work something out with Rainier. Otherwise I'll have to come up with something else. The issue is cost. To make just a few of them isn't very cost effective but with a small demand its probably not going to be worth running a whole bunch of them.
Cost wise I'm hoping they can retail around $125 but thats yet to be determined.
Once they are a go I will update the post.
Thanks for the interest.
Greenrifle
04-27-09, 15:35
I could justify buying 1 at around that price point. Thanks for the effort you put into this.
Comp1911,
Any news on an ETA?
-RD62
you should have these on the market by now, man! whats the holdup?
The Vltor drilling jig should be available in the next two weeks.
what this about Vltor's version? are there any pics.? come on, details please!
great job comp1911, I'm sure you'll work out any bugs, it's always fun and rewarding to come up with bigger and better ways to get 'er done!!!
what this about Vltor's version? are there any pics.? come on, details please!
great job comp1911, I'm sure you'll work out any bugs, it's always fun and rewarding to come up with bigger and better ways to get 'er done!!!
barrel dimple jig (http://www.rainierarms.com/?page=shop/detail&product_id=1089)
gas block pin jig (http://www.rainierarms.com/?page=shop/detail&product_id=1398)
Both appear in stock and ready to ship from Rainier Arms, which is where I got mine, and to the best of my knowledge is the only place to buy them from.
-RD62
barrel dimple jig (http://www.rainierarms.com/?page=shop/detail&product_id=1089)
gas block pin jig (http://www.rainierarms.com/?page=shop/detail&product_id=1398)
Both appear in stock and ready to ship from Rainier Arms, which is where I got mine, and to the best of my knowledge is the only place to buy them from.
-RD62
those are both for the low pro gas blocks and will not work for the A2 frt sight bases.
Roger that. For the VLTOR low-pro gas blocks. The thread you quoted was from back in Feb. of this year. The low-pro are in production and shipping, as far as I know the FSB model jigs are not yet released, although I am waiting too! :D
-RD62
50 FSB jigs were shipped to Bravo Company last week. :eek:
http://img.photobucket.com/albums/v224/comp1911/Guns/gas%20block%20jig/IMG_3025.jpg
:cool:
i will be checking the website daily- i assume they will be selling these, correct?
Hell yeah. I will be waiting like a nun heading to a Ricky martin concert.
comp1911,
very nice work! What kind of mill is that in the pictures?
Yes, Bravo will be selling them. Acutally they will be selling all 3 of my jigs. :D
The mill pictured is my cheap Harbor Freight mini mill. I used it for small jobs like drilling FSB's.
The jigs are made on CNC equipment. :cool:
I finally got a reply back from Bravo, this is what they told me.
The FSB fixture is made by BRD engineering .
Should be online later this month.
???????????????????????????????
I finally got a reply back from Bravo, this is what they told me.
The FSB fixture is made by BRD engineering .
Should be online later this month.
???????????????????????????????
still haven't seen anything... ?
Superb! I like it. A lot.
sure would be nice if these would eventually be available sometime soon!!!
krinkov5.45
11-25-09, 13:15
I guess the didn't say what year. Or century.
i know they're just sitting there.. all it's gonna take is for someone to freaken post them on the website, but they just wont do it.
all to spite me.
:mad:
who can i call? i want to talk to the person who hates me so much.
i know they're just sitting there.. all it's gonna take is for someone to freaken post them on the website, but they just wont do it.
all to spite me.
:mad:
who can i call? i want to talk to the person who hates me so much.
I replied to your PM.
I'll follow up with Paul next week when I get back to the office.
I have the same questions as you guys.
In stock now.
http://www.bravocompanyusa.com/BRDE-Fixture-for-Drilling-Pinning-Front-Sight-Base-p/brdejig3.htm
Congrats! While this will not make you a rich man, it does make you feel like you accomplished something. Good job on helping the AR world.
Congrats! While this will not make you a rich man, it does make you feel like you accomplished something. Good job on helping the AR world.
LOL, you nailed that one. It does help pay for parts and ammo. :D
50 FSB jigs were shipped to Bravo Company last week. :eek:
http://img.photobucket.com/albums/v224/comp1911/Guns/gas%20block%20jig/IMG_3025.jpg
:cool:
Awesome looking jig!
Nice to see this thread back.
I searched and read a bunch of threads here and this jig is what I need. I bought a stripped bbl a gas tube and taper pins. I had everything else to build my upper. Or so I thought. The only other upper I assembled was one with a bbl that came with a fsb. I did not realize the fsb needed to be drilled for the pins while it was on the bbl. I have a used one and it was already drilled soooo I thought I was good to go. l realized what Dumb mistake I made when I went to put the taper pins in!
So I have a semi used bbl that will not work in my A1 upper with out another $120-130 in work and shipping. I should have bought the complete flat top upper and stripped it for the parts and lived with the F height fsb. Now I need to decide what to do. Fix the bbl, keep it for a later project with a low gas block or sell it at a loss. This was a little bit of life's tuition.
I love all these jigs your working up! I've been aligning them on my mill with a DTI, but now I have got to have one of these! Great work!
I searched and read a bunch of threads here and this jig is what I need. I bought a stripped bbl a gas tube and taper pins. I had everything else to build my upper. Or so I thought. The only other upper I assembled was one with a bbl that came with a fsb. I did not realize the fsb needed to be drilled for the pins while it was on the bbl. I have a used one and it was already drilled soooo I thought I was good to go. l realized what Dumb mistake I made when I went to put the taper pins in!
So I have a semi used bbl that will not work in my A1 upper with out another $120-130 in work and shipping. I should have bought the complete flat top upper and stripped it for the parts and lived with the F height fsb. Now I need to decide what to do. Fix the bbl, keep it for a later project with a low gas block or sell it at a loss. This was a little bit of life's tuition.
Can you tap the fsb and then mount it to the barrel with screws of some type?
IIRC some of the target guys used to do that so they could shift the front sight a bit.
Can you tap the fsb and then mount it to the barrel with screws of some type?
IIRC some of the target guys used to do that so they could shift the front sight a bit.
NOT recommended for anything but a target gun.
NOT recommended for anything but a target gun.
Ya beat me to it. I thought the fsb from Fulton Armory would work but BKB and BCM both suggested it was not goof for a fighting gun. I respect their advice.
I gotta say the upper on the front of the BCM catalog has been calling to me. I think sucking it up and droping another C note is what I need to do!
NOT recommended for anything but a target gun.
Agreed. Just trying to salvage a barrel.
But a low profile will do the same.
It shows them being out of stock, any idea when they might be back in stock?
It shows them being out of stock, any idea when they might be back in stock?
The last post was 9 years ago, the maker hasn't posted since 2015, I think you need to call BCM in order to find out.
BRD isstill has them on their page, maybe call them also:
https://brdengineering.com/products/front-sight-base-jig
Powered by vBulletin® Version 4.2.5 Copyright © 2024 vBulletin Solutions, Inc. All rights reserved.