The CMMG 22ARC Firing Pin Spring 22BA4A4 (UPC 810046235799) is a small but critical replacement part designed specifically for CMMG .22 LR AR conversion kits. If you run a CMMG 22ARC/Bravo-style .22 LR AR-15 for training, plinking, or small game, keeping a dedicated firing pin spring on hand helps ensure reliable ignition, consistent performance, and minimal downtime when parts eventually wear out. CMMG - AR 15 and AR 10 Builds and Parts+1
Purpose-Built for CMMG .22 LR AR Conversion Kits
This firing pin spring is engineered by CMMG to work with their 22ARC / .22 LR AR conversion bolts, not just a generic spring cut to size. That means:
Correct length and tension for CMMG .22 LR AR conversion units
Designed around .22 Long Rifle rimfire ammunition and the unique geometry of the conversion bolt CMMG - AR 15 and AR 10 Builds and Parts+1
Drop-in compatibility with CMMG 22ARC / Bravo-style .22 LR conversion systems used in AR-15 platforms PAWholesale+1
Because it’s made for the CMMG kit from the ground up, you don’t have to guess about fit or function—this is the exact spring CMMG specs for their 22ARC firing pin.
High-Quality Spring for Consistent, Reliable Ignition
The firing pin spring plays a key role in how consistently your rifle ignites rimfire primers. This CMMG 22ARC spring is built to deliver:
Stable, repeatable firing pin energy for confident ignition shot after shot
Smooth cycling in the conversion bolt, helping maintain reliability during high round-count sessions
Robust construction from durable spring steel (commonly stainless in many listings) for heavy-duty use OpticsPlanet+1
Over time, any firing pin spring can fatigue—especially in a high-volume .22 LR trainer. Swapping in a fresh, factory-spec spring is one of the easiest ways to cure light strikes, intermittent ignition, or inconsistent performance.
Factory-Spec Replacement – Part #22BA4A4
When you see CMMG’s part number 22BA4A4, you know you’re getting the official factory-spec firing pin spring for the 22ARC system. Multiple retailers and CMMG itself list this as the specific replacement spring for their .22 LR AR conversion. Tactical Surplus USA+3CMMG - AR 15 and AR 10 Builds and Parts+3OpticsPlanet+3
Key identifiers:
Manufacturer: CMMG
Model: 22ARC Firing Pin Spring
Manufacturer Part Number (MPN): 22BA4A4
UPC: 810046235799 OpticsPlanet+1
Using the exact OEM part ensures the correct spring rate and fit, which is especially important for rimfire conversions that can be more sensitive to small changes than centerfire AR setups.
Ideal for Preventive Maintenance and Spare Parts Kits
Rimfire AR conversions are often used for:
All of that means thousands of rounds can go through a CMMG 22ARC kit in a relatively short time. Having a dedicated firing pin spring in your bench drawer or range bag is smart insurance. PAWholesale+1
This spring is perfect for:
Refreshing older 22ARC bolts that start to show light strikes
Building a small CMMG spare parts kit (alongside extractor springs, recoil springs, and firing pins)
Armorer and gunsmith work, where quick turnarounds on repairs and tune-ups matter
For the cost of a single spring, you can prevent a lot of frustration on the range.
Compatible Systems & Intended Use
The CMMG 22ARC Firing Pin Spring 22BA4A4 is designed for use in:
Typical uses include:
Plinking & recreational shooting with inexpensive .22 LR
Training and drills that replicate AR-15 handling at lower cost and recoil
Small-game hunting & pest control using dedicated .22 LR AR builds
Always verify compatibility with your specific CMMG conversion kit or upper by checking your manual or CMMG’s official parts listings.
Compact, Easy-to-Install, and Range-Ready
Because this is a single small spring, it’s:
Simple to install during routine bolt disassembly and cleaning
Easy to store in a small parts organizer, range kit, or armorer’s box
Lightweight and inexpensive, making it practical to buy multiple spares at once
Combined with a clean firing pin channel and properly maintained bolt, this spring helps keep your .22 LR AR running smoothly so you can focus on shooting, not troubleshooting.
Specifications – CMMG 22ARC Firing Pin Spring
Why Choose the CMMG 22ARC Firing Pin Spring 22BA4A4?
If you rely on a CMMG 22ARC / .22 LR AR conversion kit for training, practice, or fun, this OEM firing pin spring is one of the most important small parts you can keep on hand.
You get:
A factory-correct, drop-in replacement designed specifically for CMMG 22ARC systems
Improved ignition reliability and consistency when replacing a tired or worn spring
A low-cost, high-impact spare that belongs in every CMMG .22 LR owner’s maintenance kit
When your AR-15 trainer needs a tune-up, the CMMG 22ARC Firing Pin Spring 22BA4A4 makes it easy to restore dependable performance and keep your .22 LR sessions running smoothly.
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