Quote:
|
Integrated Spring Management Inc. (ISMI) recommendation for recoil spring replacement: “The recoil spring should be changed, at the latest, when it has lost .500” of free length from new. At this point, the spring has suffered a considerable reduction in load exerted at installed length. (When the gun is in battery).“
|
I'm sure the ISMI "rule of thumb" applies to many guns, especially full-size guns, but for some compact and sub-compact guns, the .5" rule probably isn't good.
And then there are the recoil springs that are captive so that you can't tell their "natural/relaxed" length to compare that to a newer spring.
It is interesting to note the way different firms look at the problem, however.