Description
Furnish your AR-15 with a reliable, high-quality receiver extension using the  AR-15 Mil-Spec Buffer Tube Kit | Carbine 6-Position | 3 oz Buffer — a complete package built for durability, compatibility, and smooth operation.
Durable 6061-T6 Aluminum Construction
The carbine 6-position mil-spec buffer tube is precision machined from 6061-T6 aluminum for exceptional strength and long service life. The tube is fully finished inside and out and highly anodized with a polished bore to reduce friction and improve cycling reliability under heavy use.
Universal Mil-Spec Compatibility
Designed to accept all mil-spec carbine stocks, this receiver extension provides a hassle-free fit with a wide range of buffer-stock combinations. Whether you’re building a new rifle or upgrading an existing one, the Aim Arms kit integrates cleanly with standard mil-spec components.
Complete Mounting Kit
This kit contains everything needed to install a proper mil-spec carbine setup:
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6-position mil-spec carbine diameter receiver extension (buffer tube)
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Full 3 oz carbine buffer
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Heavy-duty carbine buffer spring
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Castle nut (receiver nut)
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Mil-spec receiver end plate
Each component is selected to work together for consistent, reliable performance.
Build with Confidence
Whether you’re a seasoned builder or assembling your first AR-15, the Aim Arms Mil-Spec Complete Buffer Tube Kit delivers the strength and compatibility you need to build or upgrade with confidence. Rugged construction, polished/anodized finish, and a full parts package make this kit a smart choice for durable, mil-spec carbine applications.
Warning: This product can expose you to chemicals, including lead, which is known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.
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