Spring Weights
ISMI Spring Compatibility with NDZ Guide Rods
NDZ guide rod assemblies run ISMI recoil springs — here's what that gets you.
What ISMI springs are
ISMI recoil springs are precision chrome-silicon springs known for holding their rated poundage and not taking a set over a high round count. That's the reason a lot of shooters run them over plain music-wire springs — a 15 lb stays a 15 lb, so the gun behaves the same at round 5,000 as it did at round 5.
How they pair with NDZ rods
NDZ guide rod assemblies are built to run ISMI recoil springs, and NDZ offers its assemblies with your choice of spring weight. So you get a rigid stainless rod and a quality, consistent spring working together — the rod keeps it straight, the spring does the tuning. Pick the weight for your ammo and how you shoot, then test to confirm.
FAQ
- Do NDZ guide rods run ISMI springs?
Yes — NDZ guide rod assemblies are compatible with ISMI recoil springs.
- What's the deal with ISMI springs?
They're precision chrome-silicon springs that hold their rated poundage and resist taking a set over a high round count — more consistent, repeatable cycling than plain music-wire springs.
- Do I pick the ISMI spring weight separately from the rod?
NDZ offers its assemblies with a choice of spring weight, so you pick the weight for your ammo and use. Not sure which? Test with a Tuner Pack or ask NDZ.
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