98Z5V Posted July 1, 2018 Report Share Posted July 1, 2018 (edited) Well, Armalite discontinued their clamp-on A2 Front Sight Base; I don't know when they did it, but it was an excellent piece of kit. Ive used two of them in the past, and they really work well. Alas, they're gone forever now... This is the old Armalite setup... you can still find old-stock, but even Optics Planet wants $75 for one. I used to pull these things for $40 on sale (no sight assembly in there)... So, I've got a project coming up, and I NEED an A2 FSB that I can use on a barrel. The search for clamp-on versions will eventually lead you to Daniel Defense. Wow! What a NICE A2 FSB!!! Another one that you'll probably find is the JP A2 FSB, that's got adjustable gas - again, Wow! What a nice piece of hardware! And... on both of those - Wow! What a PRICE on those things!!! So, into the parts boxes I go. I found an old Colt F-Marked FSB in there, complete. Still had the front sight post,spring, detent in it. Bayonet lug and front sling swivel, too. So, out with the front sight assembly, off with the sling swivel, and it went to work with me. I chopped off the bayonet lug and the sling swivel ears, and ran the bottom over the belt sander to smooth everything out. There are 5 holes in this thing already - the bottom hole was there between the sling swivel ears, because that's the hole they use to drill the gas port in the FSB. The other 4 holes are 2 each side, where the tapered pins went through. We're off to the races now - you'll need a #29 drill bit, an 8-32 tap, and (6 each) 8-32 set screws. You WILL need an automatic center punch, as well. You should have one of these in your toolbox, anyway, so you can "stake" your carbine endplates into their lockrings - one guy that was here called that "mangling" your parts. I just call it "the right way to do it..." Your choice - I had a bottom hole at the back, and also wanted one at the front - you mark it's proposed location with the center punch, drill it, and you're set. You should pass the #29 drill bit through all 6 holes - you'll find that it barely touches the larger sides of the tapered holes, and barely touches the bottom hole, that was already there - that's okay. You will need to drill up the smaller sides of the tapered holes, and that new front hole that you just made. After drilling everything, tap them all with the 8-32 tap. This is the front, where you'll need the new hole... These 6 set screws will lock this thing onto your barrel like nobody's business - have no fear of it shifting or twisting... unless you're trying to beat someone's a$s with your rifle... Edited July 1, 2018 by 98Z5V Quote Link to comment Share on other sites More sharing options...
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