Ruger and NECG has banded front sights. The NECG Masterpiece comes in many band diameter sizes, whereas the Ruger is rifle type specific, such as 1a, 1s, 1h etc. NECG sells a lot of different height front sight inserts. You might do a little reading on the iron sight charts(Brownells etc) about how to choose iron sight heights, a dial calipher is a nice tool to have.
If you barrel is a lightweight, then the 1a type might be a possibility to consider. On a factory Ruger, the Ruger oem sight might be more fitting, but those cosmetics are up to the user.
In either case, the front banded sight comes to you straight bored, the band's interior is straight bored, to include the bottom surface of the ramp. Your rifle barrel has a taper to it, so in order for the sight's band to fit nicely fore/aft, it needs to be fitted to said specific barrel. Some use a boring technique, but I have used the NECG suggested methods with good success. The NECG suggested method can be done without a lathe, but the boring probably is better executed via the lathe. In both methods, some cosmetic polishing after fitting is required. One might note that the Ruger comes a bit rougher than the NECG in initial finish; but is about half the price.
In order to get sights "straight up" the operator has to determine how to go about that. Some use a jig and surfaces on the barreled action, some use a homebrew holding affair on a big mill. Some can get by with a drill press, but that really takes some patience and expertise. A nice precision level could be in that mix.
In fitting the banded ramped front sight to the tapered barrel; one has to worry not only about the tapered diameter of the band itself, but also the inclined plane of the ramp itself. The final proof is a banded front sight that appears seamless with the barrel proper.
Both the Ruger and the NECG come with a screw that hits the barrel surface. This really is not for holding the banded sight on, but rather for positioning to some degree. Once the sight is fitted to the barrel, both band and ramp, the real tense work begins to get the sight "straight up".
As mentioned some use a mill or jig. Some can get buy with a temporary affixment to the barrel via a mild adhesive. You eye is a pretty good indicator, but when your eye and the instruments tell you the same story, tis a good time to think about permanency. Once the sight is pleasing, some use a soft silver solder like Brownell's 44 or some will use a Loctite retainer, such as 620. The retainer certainly is a lot easier to cleanup, and has right good strength.
The temporarily mounting of the sight to the barrel gives you a second chance if need be without marring things up. Make sure it is an adhesive that will release with just a little heat during initial trials. Choose an adhesive for the initial setup that will allow some tapping of the sight to final position. The 620 takes a lot of heat to remove, so 620 is not the adhesive to use for the temporary set up. The 620 is not a instaneous lockup, but after a few minutes she is there.
Not a overly big deal to do, but one does have to keep things on your mind or the ramp/sight can be ruined or lets say; saved for a larger barrel. Keep in mind that the front band can only be stretched so far before it will workharden and crack, so pick the intial buy wisely.
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