Wolff gunsprings

[USGI]

Several years ago Sportsman's Guide and Sarco sold op slide springs that were USGI. I sold one a couple years ago (should've kept) that came from Sarco in 1993. The last (2) I got from them both measure 11-1/2" so that length must be common for repros now. The last Carbine I bought (4 years ago) came with one of those longer springs and it was pretty hard to get it stuffed into the receiver. I was a bit worried it might cause "coil binding" so replaced with a worn 10" GI spring. Some (maybe all?) of those 11-1/2" ones are a bit short on the coil count, so probably wouldn't actually bind when the slide slams back. How long are the Wolff springs? - Bob