SKU: LBCBUFKIT
UPC: 765857617312
The LBE AR Commercial Buffer Tube Kit from LBE Unlimited is a complete, USA-made retrofit assembly designed for AR-platform rifles using commercial-diameter receiver extensions. This six-position commercial spec buffer tube kit delivers the core components needed for rear-end stock assembly, offering shooters a field-proven upgrade path for carbine-length recoil management.
The kit includes a six-position commercial-spec buffer tube, carbine-length recoil spring, standard carbine buffer, receiver end plate, and castle nut—all the pieces required for a complete buffer assembly installation. Commercial-diameter tubes (1.148 inches) fit standard commercial-spec upper receivers and are incompatible with mil-spec diameter tubes, so proper identification before purchase is critical. The included carbine-length spring and buffer are engineered for standard-length gas systems common in carbine-pattern rifles, delivering consistent cycling velocities across standard rifle loads. End plate and castle nut installation ensures the assembly locks securely without rocking or play during firing.
This buffer tube kit serves armorer-level builds, platform conversions, and field replacements where the original rear assembly is damaged, worn, or incompatible with a desired stock platform. Operators running commercial-diameter uppers—whether from budget builds, legacy platforms, or specific manufacturer designs—rely on commercial-spec buffer tubes to maintain cycling reliability. LBE Unlimited's domestic manufacturing ensures supply consistency and direct quality control throughout production, critical for operators who depend on interchangeable parts sourcing.
The AR platform dominates patrol, training, and tactical use across law enforcement and civilian communities partly because of standardized assembly kits like this one. Commercial-spec components have become more prevalent in recent years as manufacturers diversified beyond strict mil-spec production, making compatible replacement kits essential for maintaining mixed-origin platforms common in field arsenals.
WARNING ⚠️
You must be 18 or older to purchase shotgun or rifle ammunition and 21 or older to purchase handgun ammunition and firearms. Please reference our requirements for ammunition orders to "restricted" states HERE. Always make sure you use the correct ammunition for your firearms. Ammo cannot be shipped to a PO Box. Please reference state & local laws before making a firearm or ammunition purchase.
Purchasing a Firearm? Click HERE to see our firearm purchasing guide.
