Which Lyman rear peep sight for 1977 Investarms 58 cal ML?

oscarflytyer

oscarflytyer

Well-Known Member
I have a 1977 made Investarms 58 caliber ML. Looking at adding a receiver peep sight. I see both the Lyman 57 SML and 57 GPR sights listed, for a couple different Hawkins rifles. Anyone happen to know which one of the sights would fit the Investarms 58 properly? I can't tell from the Lyman rifle models they list the sights for. TIA
 
J

Jeff H

NW Ohio
Does your tang look like this? This is my Lyman Great Plains 50. If you have t he front screw like this one, the Lyman 57GPR should fit, but you'll need an extra hole for the back sight base hole (8-32) and maybe have to shim to get the sight parallel with the bore. See page 3/8 in the PDF I've linked to:



LGP-006 (Copy).jpg

As you can see, this was made by Investarm also - look to the far left on the flat closest to the top of the photo. This one was made in 1987. The barrel is 15/16" across the flats though and I'm guessing your 58 is probably 1 1/16" or 1 1/8", maybe? I don't think that would matter though, because the triggers would have all been the same and the front tang screw goes into the trigger base.

LGP-004 (Copy).jpg
 
oscarflytyer

oscarflytyer

Well-Known Member
My tang looks identical to yours. And I saw other posts about maybe needing to shim. My bbl is 'supposed' to be 15/16", but it mics at more like 31/32"
 
J

Jeff H

NW Ohio
This has been an enduring design and a wonderful gun. While poking around, it seems that Lyman no longer offers this model. It looks like Investarm still has it available, but I have no idea if anyone is importing it. That's a shame, because these are great rifles.

Make sure you check out that PDF. If your tang is case-hardened (I know mine is because I was the one who did it), you'll need to break through that hardened "skin" to drill/tap, but it's not difficult. Some may cringe, but It could be done with a hand-drill if you have a secomd perso with a "square eye" to eyeball it 90 degrees from where you're seeing it.
 
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