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

[oscarflytyer]

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

[1Hawkeye]

If I remember right it takes the same as a t/c hawken the gpr is for the lyman great plains rifle.

[LAGS]

Both the TC and GPR use the same rear tang mounted sight.
But the sight for the GPR comes with a wedge shape plate to make the sight fit the steeper angle of the GPR which is a greater angle down than the TC Hawken tang.

[KCSO]

I just sold one and it had the same rear sight as a savage 99, and a Lyman 17a front.

[Woodnbow]

The investarms is the same rifle as the Lyman isn’t it?

[Jackrabbit1957]

Investarms is the manufacturer of the Lyman plains rifle line, the GPR is in that line.