Description
XTS Buffer Tube Complete Assembly Includes Buffer Buffer Tube Buffer Spring Castle Nut End Plate Fits AR 15 Rifles Black XTS BTA MIL UPC 767820091167
The XTS Complete Mil-Spec Buffer Tube Assembly in Matte Black (MPN: XTS-BTA-MIL) is an all-in-one lower receiver extension kit engineered to provide seamless stock fitment, reliable action cycling, and proper recoil mitigation for standard AR-15 platforms. Precision-machined from high-strength 6061-T6 aircraft aluminum and finished in a durable hardcoat anodized black, the 6-position receiver extension tube accepts all standard Mil-Spec carbine buttstocks and stabilizing braces.
This turnkey completion kit includes a standard 3.0 oz carbine recoil buffer, a heavy-duty heat-treated carbon steel carbine buffer spring, a steel castle nut, and a standard steel lower receiver end plate. Designed for consistent BCG cycling, proper bolt catch engagement, and reduced internal wear, the XTS-BTA-MIL provides smooth travel for full-auto and semi-automatic bolt carrier groups across standard 5.56 NATO, .223 Rem, and 300 AAC Blackout builds.
Whether assembling a new custom AR-15 lower receiver from a stripped housing or replacing worn extension components on a duty carbine, the XTS-BTA-MIL delivers clean thread engagement and simple installation. Backed by XTS quality assurance, it represents an unbeatable value for custom bench builds and emergency armorer replacement inventories.
Armorer Bench Notes & Real-World Staging Guidance:
Fitment Matrix: Fits standard AR-15 pattern lower receivers (Mil-Spec dimensioned) chambered in 5.56 NATO, .223 Rem, 300 Blackout, 6.5 Grendel, and 350 Legend. Compatible with all Mil-Spec dimensioned adjustable carbine buttstocks (Magpul, BCM, B5 Systems, MFT). (Note: Not compatible with Commercial-spec stocks which feature a larger tube diameter, nor compatible with AR-10 / LR-308 extended depth receiver extension requirements unless utilizing a short 308 buffer).
- Perform a complete firearm safety check: drop the magazine, pull the charging handle rearward, lock the action open, and visually inspect the chamber to verify zero live rounds are present.
- Thread the castle nut onto the XTS buffer tube with the notched staking spanner ring facing rearward toward the buttstock end.
- Slide the steel end plate onto the buffer tube with the alignment alignment index key facing forward toward the receiver frame.
- Thread the buffer tube into the rear lower receiver housing until it depresses and captures the buffer retainer pin and spring without binding.
- Slide the end plate forward into the rear lower receiver index notch, thread the castle nut forward against the end plate, and hand-tighten.
- Using an AR-15 castle nut wrench, torque the castle nut to manufacturer specification (38–40 ft-lbs) and stake the end plate steel into one of the castle nut notches using a center punch.
- Insert the carbine buffer spring and 3.0 oz carbine buffer into the tube until captured by the buffer retainer pin, then slide your Mil-Spec buttstock onto the extension tube.
Key Features
- 6061-T6 Aluminum Construction: Precision-milled aircraft aluminum extension tube delivers extreme structural strength and lightweight durability.
- Standard 6-Position Mil-Spec Profile: Allows precise length-of-pull adjustability with standard Mil-Spec adjustable stocks and braces.
- Complete Turnkey Assembly Kit: Includes buffer tube, 3.0 oz carbine buffer, carbine spring, castle nut, and receiver end plate out of the box.
- Type III Hardcoat Anodized Black Finish: Provides superior corrosion protection, scratch resistance, and low surface friction.
- High-Tensile Steel Carbine Spring: Heat-treated spring ensures smooth cycling and positive battery closure under sustained fire.
- Universal AR-15 Lower Compatibility: Drops seamlessly into all standard Mil-Spec forged and billet 5.56/.223 lower receivers.
Product Specifications
- Brand: XTS (Xtreme Tactical Sports / DMA Inc.)
- Model/Series: Complete Mil-Spec Buffer Tube Assembly Kit
- MPN / SKU: XTS-BTA-MIL
- UPC: 767820091167
- Tube Diameter: Mil-Spec Standard (1.148 Inches)
- Positions: 6-Position Receiver Extension
- Platform Compatibility: AR-15 / M4 Lower Receivers
- Buffer Mass: 3.0 oz (Standard Carbine Buffer)
- Materials: 6061-T6 Aluminum Tube / Steel Nut, Spring, End Plate
- Finish / Color: Matte Black Hardcoat Anodized
- Total Kit Weight: 9.8 oz
- Country of Origin: USA / Imported
