View Full Version : Where to get A2 FSB?
Does anyone know where to get an A2 Front sight base (preferably one that has already been drilled)? I saw them somewhere but now I can't find them. My upper has not been drilled because it came with a so called "low profile" gas block that won't fit under most free float rails, but I can do that my self.
NCPatrolAR
05-25-09, 18:41
Bravo Company
Bravo Company
bravo's just got F-marked. as much as i hate their website, specialized armament would be a good place to look for A2s
might try fulton armory, also
bravo's just got F-marked. as much as i hate their website, specialized armament would be a good place to look for A2s
might try fulton armory, also
Oops. I want the F marked ones but need to have one with holes for the taper pins drilled so I know where to drill the barrel.
Oops. I want the F marked ones but need to have one with holes for the taper pins drilled so I know where to drill the barrel.
ah.. well bravo is the place, then. dsgarms.com has the spring/detend/post, if bravo doesn't.
as to drilling- i'd HIGHLY recommend drilling through both at once. there might be some scientific formula, but this has served plenty a gunsmith... just center fore and aft on the blocks and come in .0995 (.1, but err on the short side) on a .745 barrel.
http://c4.ac-images.myspacecdn.com/images02/112/l_428dd9b3c73540739ecba0d3850294f7.jpg
http://c1.ac-images.myspacecdn.com/images02/86/l_1c362bd27f574d6daebcf929c1c99de0.jpg
You'd be better off sending it to ADCO for the install. I'll build them , troubleshoot them, and tinker with them. But I want my FSB perfect. No tilt, either way. Are you up to it? I'm not.
I think I found it.
Will this work? It already has the holes drilled. Is the company any good? I just think it would be easier to screw up the barrel if the taper pin holes aren't drilled as refrence.
http://blackrifleworks.com/sight-post-without-lug-p-52.html
You'd be better off sending it to ADCO for the install. I'll build them , troubleshoot them, and tinker with them. But I want my FSB perfect. No tilt, either way. Are you up to it? I'm not.
where's your sense of adventure? :cool:
i'm neither a gunsmith nor machinist by trade, but the few i've done have come out DNC.
I think I found it.
Will this work? It already has the holes drilled. Is the company any good? I just think it would be easier to screw up the barrel if the taper pin holes aren't drilled as refrence.
http://blackrifleworks.com/sight-post-without-lug-p-52.html
never tried it, and wouldn't... i suppose the taper pins will tighten up the inherent discrepancies, but you really gotta make sure you get those suckers lined up right, or your pins will cant the FSB as you pound them in.
my one experience with blackrifleworks was pretty sour.. they told me they had gas tubes in stock, so i placed an order, they billed my card... and 7 months later, after dozens of phone calls and increasingly angry emails demanding an ETA, then cancel my order, went unanswered, and after i'd already placed and received an order elsewhere and long since completed the builds in question, i received my gas tubes.
What size are the holes?
Would it be easier to tap the holes and use set screws? If so any perticular thread/screw size?
Would it be worth buying one of Brownell's Front Sight Bench Block be worth buying to help drill the holes?
where's your sense of adventure? :cool:
i'm neither a gunsmith nor machinist by trade, but the few i've done have come out DNC.
No shit? Hmmm, maybe I need to try one. I like new things and I like tinkering I just never considered it. Of course I paid someone years ago to change out a stock.:o Now of course would never even consider it.
Being that the pins are tapered are the holes larger on one side than the other?
Being that the pins are tapered are the holes larger on one side than the other?
yep.. you're gonna need to hand ream you're pilots, unless you have access to a CNC. it sounds like you don't have much machining experience... when i say this is easy, i guess i forget to mention it's only easy if you already possess shop tools and know how to use them.. the reamers are specialty items, for instance- your local hardware store ain't gonna have 'em.
you'll need a 2/0 reamer and and a t-handle with a 1/8th chuck- if you don't already own these, you might find it cost prohibitive to try it yourself. a decent taper reamer set will run you about $200, but you might be able to find a single 2/0 bit for $40-50 or so. you'll also need to drill the pilot holes on a solid variable speed mill- and the more i think about it, the more certain i am that if you use an FSB with pre-drilled holes you're just begging for disaster. you only get 1 shot at it, and if you **** it up, there really arent a lot of options other than a clamp-on gas block.
Nope, not that much machining experience but probably have the tools to do it. If I don't have the right tool my friends dad owns a machine shop so have access to any machining tool that could be needed. Would it be easier If I tap the FSB and use set screws?
set screws work.. theres two different ways to do them, depending greatly on your needs- you can tap the barrel and FSB the same way you would with pins, or you can just tap the FSB and set-screw into the barrel. option 1 is a really secure option, so long as you loctite the shit out of the screws.. option 2 isn't very secure, but service-match guys like 'em because they can make minute adjustments to the FSB without getting out the sledge hammer.
the best way is taper pins, though. you can also straight-pin it- it's not as secure as taper-pins, but it a lot easier, and more secure than any screw method.
I have no experience with either one these setups, this thread reminded me.
http://m4carbine.net/showthread.php?t=26630&highlight=block
Same person also makes this:
http://m4carbine.net/showthread.php?t=26630&highlight=block
I have no experience with either one these setups, this thread reminded me.
http://m4carbine.net/showthread.php?t=26630&highlight=block
Same person also makes this:
http://m4carbine.net/showthread.php?t=26630&highlight=block
I saw that a couple of weeks ago. I only plan On Installing 1 so $125 for something that I will only use once seams kind of pricey.
bkb0000- I would use the first method you described. Would it be possable to stake the set screws so they couldn't come loose?
Would it be possable to stake the set screws so they couldn't come loose?
kind of a pain in the ass, but hell yea. i'd recommend a spring loaded punch, rather than beating on a hammer set.
don't mention it!
good luck.
i'm gonna be doing another one here in the near future.. if i remember to take pictures perhaps i'll share with the community
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