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March 13, 2016
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I have a 15-2V pistol pack. On my three smallest barrels, I have no problem with the front sights sitting flush to the top of the barrel shroud. However, on my 8", the back edge of the front sight sits flush, but there's around a 1/32 gap near the muzzle. It's almost like the front part of the sight slot in the shroud was not machined quite deep enough. Has anyone run into this issue?
DWF Supporters
February 1, 2016
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Xandrosi said
I have a 15-2V pistol pack. On my three smallest barrels, I have no problem with the front sights sitting flush to the top of the barrel shroud. However, on my 8", the back edge of the front sight sits flush, but there's around a 1/32 gap near the muzzle. It's almost like the front part of the sight slot in the shroud was not machined quite deep enough. Has anyone run into this issue?
Not really, did you try tapping w/a plastic mallet ?? Or maybe not machined right, Is it a Monson or what ?
SIZE DOES MATTER
March 13, 2016
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Yes, made in Monson circa 1979. Didn't tap with hammer. Only the depth in front part of front slot is giving me grief. I have eight sights altogether. None of them sit right in front in this one shroud. The only way I can see this being fixed is to take an impression of a correctly machined slot and compare that to the one in the 8". It's so precisely machined that I'm not clear that it can be fixed without damaging the slot or front set-screw threads. Hoping that someone else has run into this or has a recommendation about who has the right tools to make this work.
I've lived with it and can conceivably adjust my rear sight to compensate. It's just annoying.
February 16, 2016
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Xandrosi said
The back edge of the front sight sits flush, but there's around a 1/32 gap near the muzzle. It's almost like the front part of the sight slot in the shroud was not machined quite deep enough.
Are you sure you backed the Retaining Screw out enough when re-installing the sight?
March 13, 2016
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Literally removed the retaining screw just to make sure.
August 29, 2009
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Grind down the bottom of the sight - you won't see it in the slot and it should allow the sight to sit flush on the rib.
If you have a caliper you can check the depth but if you grind down the bottom of the sight it should take care of it.
March 13, 2016
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HarleySftl said
Grind down the bottom of the sight - you won't see it in the slot and it should allow the sight to sit flush on the rib.If you have a caliper you can check the depth but if you grind down the bottom of the sight it should take care of it.
Probably the easiest way. I have a jewelers file that should do the trick. Need to be careful not to mess up where the retaining screw catches. May try wax to contrast good with bad.
Thanks for suggestion.
Dans Club
March 2, 2008
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Probably the kind of project to go slow and take just tiny bites until you get a good fit.
I went to a bookstore and asked the saleswoman "Were is the Self Help Section?" She said if she told me, it would defeat the purpose.
George Carlin
August 29, 2009
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You have at least this much material to work with...
February 16, 2016
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Did you check the groove for debris or foreign material ?
DWF Supporters
February 1, 2016
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Stinger said
Have you tried a couple of different front sights ... maybe the problem isn't the shroud.
He said he tried 8 diff, sights 
I would suggest measuring w/a depth gauge, between two shrouds and compare.
If you don't have a depth gauge , you can use a drill bit or small screwdriver, then
measure difference, before cutting a sight, may even have ??? stuck in groove. 
SIZE DOES MATTER
March 13, 2016
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Attacked the problem as a father/son project. Using my caliper and its depth gauge, I discovered that while the slots were uniform across all four shrouds, the pin in the 8" shroud had been incorrectly drilled deeper and further forwards in the slot. Using jeweler files and over around four hours, alternating between a tiny rat-tail and half bastard, I changed one sight so that it now sits perfectly (removed area in purple). A great deal of satisfaction when it finally sat in snugly and locked in place. Thanks all for the advice.
February 16, 2016
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Interesting problem and perfect resolution .. thanks for the update.
Dans Club
December 5, 2008
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Congratulations! Enjoy the satisfaction of success.
February 2, 2009
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Have a model 40 Monson that I got in a pawn shop several yrs ago, took a year to find ammo for it till I started reloading for it, upon 1st firing the cylinder snapped open, seems the locking latch wasn't seating deep enough, could actually push the cylinder open from the other side. I used a diamond point Dremmel and gently opened the slot till the latch seated, and yes I scrubbed and cleaned the slot before ever trying machining it. So even Monson had some less than perfect guns make it past QC. I've been shooting mine since 1992 and have had no more problems with it. Glad you got your sight problem fixed.
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