3.5" AR .223/5.56 Short Buffer Tube System

The 3.5" AR .223/5.56 Short Buffer Tube System is built for compact AR platforms — ideal for pistol builds, SBRs (short-barreled rifles), and minimalist configurations where a shorter buffer tube is required. Constructed to OEM dimensions and tolerances, this system supports reliable cycling when paired with the correct short buffer and spring configuration.

Engineered from high-grade aluminum and finished for corrosion resistance, the short buffer tube is precision-machined for consistent performance. This kit includes the short buffer tube, castle nut, end plate (standard or QD option), and a recommended short buffer (select model) — everything you need for a clean, compact install.

Kit Includes (example):

• 3.5" short buffer tube (pistol-length dimension)

• Castle nut (hardened steel)

• Receiver end plate (choose Standard or QD)

• Buffer retainer & spring

• Recommended short buffer (specify weight/model in options) — sold as part of kit or optional add-on

Use Cases:

• AR pistol builds (.223 / 5.56)

• Short-barreled rifle (SBR) projects

• Minimalist and PDW-style builds requiring compact buffer solutions