Bayonet help needed please

[hittman]

Which bayonet would be "period correct" for a late 70's Colt SP-1?

 

[Snake45]

M7, in an M8A1 scabbard. Ask for them by name. :wink:

https://en.wikipedia.org/wiki/M7_bayonet

 

[hittman]

Thank you.

I have one that "looks" correct but is marked USM4 CASE and the scabbard is marked USM8. What is this one for or what period is it from?

EDIT: Oops....I see now, I bet this one is for the M1 Carbine.

 

[Snake45]

M4 is for the carbine.

Your M8 scabbard will work. Only difference is the A1 has the belt hooks. The M8/M8A1 scabbard works for M4 (carbine), M5 (Garand), M6 (M14) and M7 (M16) bayonets.