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CMMG-55CA9A2
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<p style="text-align: center;">[producto de marca]</p>The CMMG AR-15 Carbine Buffer Spring (55CA9A2) is a mil-spec stainless steel replacement spring that keeps your carbine cycling reliably shot after shot. Built to meet or exceed military specifications, it fits any AR-15 with a carbine buffer tube and drops in with no modifications required. Whether you are building a new lower, restoring a duty rifle, or replacing a worn spring, the CMMG 55CA9A2 delivers the precision performance your AR-15 deserves.
SHIPS FROM: MI
COUNTRY OF ORIGIN: A NOSOTROS
MPN: 55CA9A2
UPC: 815835013480
The CMMG Carbine Buffer Spring 55CA9A2 sits inside the buffer tube of your AR-15 and controls bolt carrier group movement during the firing cycle. It absorbs recoil energy as the BCG travels rearward after each shot and provides the return force needed to push the bolt back into battery, ensuring consistent feeding and reliable ejection with every round fired.
A carbine buffer spring and a rifle buffer spring are not interchangeable. A carbine buffer spring is shorter (approximately 10.5 in.) and designed for carbine-length receiver extensions found on collapsible-stock AR-15s. A rifle buffer spring is longer (approximately 12.75 in.) and is used with full-length, fixed-stock receiver extensions. Using the wrong spring length can prevent full BCG travel, cause feeding or cycling failures, or damage internal components.
The CMMG 55CA9A2 fits any AR-15 equipped with a standard carbine-length buffer tube, including both mil-spec and commercial-spec tube diameters. If your AR-15 has an adjustable/collapsible stock on a carbine receiver extension, this spring will fit. It is not designed for rifle-length receiver extensions, AR-10/LR-308 platforms, or manufacturer-specific PDW-style compact systems.
Yes. CMMG states that the 55CA9A2 meets or exceeds mil-spec standards for AR-15 carbine buffer springs. This means it is dimensionally and functionally equivalent to or better than the specifications required for military and law enforcement carbine platforms, making it a direct drop-in replacement on any mil-spec or mil-spec-compatible AR-15 build.
Your AR-15 buffer spring needs replacing if you notice short-stroking, failures to return to battery, inconsistent ejection patterns, or visible wear such as kinks, coil bind, or flat spots on the spring itself. As a proactive measure, inspect the buffer spring every few thousand rounds and replace it during routine maintenance. On a duty rifle, defensive carbine, or competition build, staying ahead of spring wear is always preferable to a malfunction at the worst possible moment.
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