Spring Cup 5.5in Tall Swivel OD Alignment

The Spring Cup 5.5in Tall Swivel OD Alignment from WEHRS MACHINE is a bolt-on upper receiver component engineered for precision rifle builds and tactical platforms requiring repeatable, secure positioning of spring-loaded assemblies. Built for shooters and gunsmiths who demand mechanical reliability in high-round-count environments, this swivel cup serves as a critical interface point in free-floating barrel systems and chassis platforms where vibration isolation and angular correction are non-negotiable. Whether you're assembling a long-range precision rifle, a duty weapon, or a competition platform, the swivel design accommodates minor sight-line deviations without requiring frame modification.

Manufactured in steel with black paint finish, the Spring Cup 5.5in Tall Swivel OD Alignment features a 5.5-inch spring cavity paired with OD (outer diameter) alignment geometry that ensures flush seating against upper receiver lugs and mounting points. The swivel mechanism allows lateral articulation—critical for absorbing recoil impulse and reducing stress transfer to the barrel itself—while the 1.75-inch tall profile provides optimal clearance for optics mounting and charging handle operation. Weighing 2.69 lbs and measuring 7.15 x 2.3 x 7.4 inches, this component integrates seamlessly into standard AR-platform uppers and modular tactical systems without requiring permanent modifications or specialized tooling.

Law enforcement armorers, military technical specialists, and dedicated precision shooters benefit most from the Spring Cup 5.5in Tall Swivel OD Alignment when rebuilding match-grade uppers or maintaining duty rifles subject to sustained-fire training protocols. Installation is straightforward: bolt mounting eliminates permanent fitting and allows field-level replacement without gunsmiths' bench equipment. Confirm your upper receiver's spring cavity depth and lug spacing before purchase; this component is designed for standard AR-15 and AR-10 compatible platforms and will not fit pistol uppers or non-standard receivers.