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Re: M84 front sight

Posted by Pete Nelson on Thursday, 25 November 2010, at 1:10 p.m., in response to M84 front sight, posted by Thomas Jacobson on Thursday, 25 November 2010, at 11:21 a.m.

Hello Tom, and a very HAPPY THANKSGIVING.

At one time I had several of the original "standard" Front Sight Blade Pins, but my inventory (of many Springfield parts) has dwindled. I don't remember what the O.D. measurement was, but I seem to recall now that there was a light taper to them and, if my memory serves me correctly, they were inserted from right to left (i.e., Hammer side to cartouche side) and removed in the opposite direction. I would imagine that there is probably normally a 0.0005" to 0.0010" clearance between the Pin diameter and the diameter of the drilled hole in the Blade (and that the hole in the Sight Base is probably almost a light press-fit).

The only Springfield Sight Blade Pin I have now which is accessible to measure is on my very late-issue Model 1884 Carbine (S/N 474943) which has the late type Front Sight Cover which uses an elongated Pin which passes through both the Cover and the Sight boss, leaving about 1/16" to 3/32" protruding on each side. I attemped to measure the diameter of the Pin using a 6-inch inside/outside caliper, but the caliper has to lean against the "barrel" of the Sight Cover at an awkward angle, making reliable measurements questionable.

However, that having been said, I made the following measurements:

ON THE RIGHT (HAMMER) SIDE: 0.0780"-0.0785" diameter.

ON THE LEFT (CARTOUCHE) SIDE: 0.0765"-0.0770" diameter.

The Pin is in pretty good conditiuon and does not appear to have beaten around, so those dimensions are hopefully credible. However, I don't know how much nominal diametral difference there may be between the Carbine and Rifle Blade Pins.

With that caveat, I hope this information may be of some help.

Regards, PETE


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