SKU: 100044591
UPC: 810046231401
MPN: 55BA48A
The CMMG AR-15 Helical Gas Ring is a one-piece replacement gas ring for Mil-Spec AR-15 bolts chambered in 5.56 NATO, .223 Rem, and 300 Blackout. It swaps the conventional three-ring setup for a single continuous spiral that rides in the bolt's ring groove and seals against the carrier's gas chamber. Shooters who run their rifles hard, builders refreshing a worn bolt carrier group, and anyone chasing more consistent cycling will get the most out of it. As a direct-fit consumable, it drops into the same groove the factory rings occupy with no fitting required.
Standard AR-15 bolts use three separate split rings that must be staggered so their gaps don't line up, which can let gas slip past once they wear. The CMMG 55BA48A replaces all three with a single helical ring machined from 300 series stainless steel, so there are no gaps to align and one part to install instead of three. The spiral wrap maintains a continuous gas seal between the bolt and carrier through the firing cycle, which helps keep the system pressurized for reliable unlocking and extraction. Stainless construction handles the heat and fouling of repeated firing, and the single-piece design simplifies routine bolt maintenance. It fits the standard bolt ring groove across compatible AR-15 calibers, so no carrier modification is needed.
Keep one in the parts box for any AR build or as a scheduled wear item alongside extractor springs and gas tube checks. If your rifle starts short-stroking or you notice rings nearing their service limit during a cleaning, this is the part that brings cycling back in line. Install it during a routine teardown when the bolt is already out of the carrier. Pair it with our other rifle parts and stock up on a cleaning kit to keep the bolt carrier group running. Browse our full lineup of AR-15 components and shooting supplies when you're squaring away a build.
It replaces the standard three-piece split gas ring set found on Mil-Spec AR-15 bolts. Instead of three individual rings that must be staggered, the CMMG 55BA48A is a single continuous spiral that seals gas between the bolt and carrier with one part.
It fits Mil-Spec AR-15 bolts chambered in 5.56 NATO, .223 Rem, and 300 Blackout. It seats in the standard bolt ring groove on compatible carriers, so no modification to the bolt or carrier is required.
No. The advantage of a one-piece helical ring is that there are no separate gaps to line up or stagger. The continuous spiral maintains a seal on its own, which removes a common installation mistake made with three-ring sets.
Gas rings are a wear item. Check them during routine cleaning when the bolt is out of the carrier. If the rifle short-strokes, fails to fully cycle, or the rings show visible wear or won't hold the bolt under their own spring tension, it's time to swap them.
Per the manufacturer, it is machined from 300 series stainless steel. That construction stands up to the heat and fouling of repeated firing while maintaining the gas seal across the firing cycle.
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