Armaspec Stealth Recoil Spring SRS-9 Gen 4 for 9mm — 6.4 oz Equivalent
Not Yet Rated | Write the First Review SKU: 222-ARM-ARM253-9
UPC: 810048492800
MFG#: ARM253-9

Stealth Recoil Spring SRS™-9 Gen 4 for 9mm (ARM253-9) — 6.4 oz Equivalent

The SRS-9 Gen 4 is built for 9mm AR setups that benefit from a cleaner, more controlled recoil cycle. Instead of a separate buffer and spring, you get a self-contained, multi-stage assembly designed to run smoothly inside a carbine receiver extension with less spring noise and more consistent feel shot to shot.

If you’ve ever chased reliability by swapping springs, buffers, and spacers, this is the kind of upgrade that simplifies the whole system.

Why shooters choose the SRS-9 Gen 4

• Smoother cycling feel with a captured, multi-stage design

• Less spring noise compared to many traditional setups

• Consistent tension and controlled movement through the stroke

• Easier handling during maintenance since the spring is contained

Compatibility and fitment notes

Before ordering, check these quick items to avoid headaches:

• Designed for AR platform builds that use a carbine-length buffer tube

• Some bolt carriers with a rear opening under .60" may not function with this system

• Many 9mm bolt carriers use an added rear weight; the SRS-9 is intended to run without that extra weight, so confirm what your carrier requires

• Can be used with or without a buffer retainer depending on your setup and preference

Specifications

• Equivalent buffer weight (9mm): 6.4 oz

• Actual weight (complete system): 9.5 oz

• Length: 7.18"

• Generation: Gen 4

• Finish: stainless / black (varies by batch listing)

• Origin: Made in the USA

What’s included

• 1 complete SRS-9 Gen 4 recoil spring assembly (captured unit)

What changed in Gen 4

Gen 4 refines the retention and wear points compared to earlier versions, with updates intended to improve long-term durability and consistency in hard-use setups.

Helpful tips for best results

• If your build is new, confirm the bolt carrier and buffer tube are true carbine spec before troubleshooting anything else

• If you’re tuning for a specific load or suppressed use, change one variable at a time so you can feel what actually helped

• If you’re unsure about bolt carrier compatibility, measure the rear opening and check whether your carrier relies on an added rear weight

FAQ

What is this product, in plain terms?
It’s a captured recoil spring assembly for 9mm AR platforms that replaces the standard buffer and spring.

What does “6.4 oz equivalent” mean?
It refers to the buffer weight class the system is designed to match in function for 9mm setups, even though the full captured unit weighs more as a complete assembly.

Will it fit my buffer tube?
It’s intended for carbine-length receiver extensions. If you’re using a proprietary tube or non-standard length, confirm fitment before purchase.

Are there bolt carrier compatibility issues?
Possibly. Some bolt carriers with a rear opening under .60" may not work correctly. Measuring that opening is the fastest way to confirm.

Do I need to keep a buffer retainer?
Not necessarily. Some setups run without one for easier maintenance. Whether you keep it depends on your build and how your lower is configured.

Is this only for 9mm, or can I use it on 5.56?
This specific model is for 9mm builds. If you’re shopping for 5.56 or other calibers, you’ll want the corresponding SRS version matched to that platform.