So, we all know how the new Discos have the new longer spring (16 coils). Even longer than a 13XX spring (23 coils).
I happen to have HunterOne's 1377 to do some things to. I pulled the spring and, let's just say Crosman has changed things again. A new hammer spring that's more related to the original Disco hammer spring. It has 18 coils. It measures 1 7/8".
New Disco spring is 2 1/4" long.
The original 13XX spring is 2".
L-2-R...13XX, New Disco, New 13XX:

Just wanted to put that info out there.
The Monkey