0 Cart
Added to Cart
    You have items in your cart
    You have 1 item in your cart
    View Cart / Checkout Continue Shopping

    We Ship Fast!

    Order by 1PM CST for Same Day Shipping (Mon-Fri)

    The perfect kit for your next build - at a price that can't be beat.

    This Mil-Spec AR-15 Buffer Tube Kit includes the buffer tube, castle nut, lock plate, 3oz carbine recoil buffer and recoil spring. All parts are designed for easy assembly and compatibility with all your other AR-15 components.

    Backed by the AT3 Lifetime Warranty.

    Included in the kit:

    • 6 position Mil-Spec buffer tube
    • 3oz carbine recoil buffer with T6 anodized aluminum body
    • Steel Buffer Spring
    • Steel castle nut
    • Steel end plate


    • Buffer Tube Diameter: 1.146" (Mil Spec)
    • Buffer Tube Length: 7 1/4"
    • Buffer Tube Thread type: 1 3/16-16 UN-3B SPECIAL
    • Buffer Tube Material: 6061-T6 Aluminum
    • Buffer Tube Finish: Black Anodized
    • Spring Type: Carbine length, black coated
    • Castle nut type: Steel with phosphate coating
    • End plate type: Steel with phosphate coating
    • Recoil spring type: Steel
    • Buffer type: 3oz weight, carbine style

    Have Questions About this Product?

    Ask Us Now

    Customer Reviews

    Based on 8 reviews
    AT3™ Mil Spec Buffer Tube Kit

    very good quality and fast shipping.

    Thank you for the review, David. We really appreciate you taking the time out to share your experience with us. Cheers! - AB
    What's not to like

    I'm just saying, price was right, service was fast, product was exactly what I needed. can't ask for more. thanks

    Glad you are satisfied with everything, James! We appreciate your feedback. -- LM
    Very happy.

    Nothing but superb service and amazing parts for less, it’s the 3rd time I buy from them and definitely not my last.

    We really appreciate you, Gjon! Again, thank you for your feedback. It's our pleasure doing business with you -- LM
    Smiling Customer

    My second order(for sure not my last). Totally impressed with the quality, maching is impeccable and finish is outstanding ! Speedy Del.

    Quality Buffer Tube Kit

    Installed without issue, buffer spring, buffer tube, buffer, back plate, and castle but were quality components. I would recommend to anyone building their own rifle. I would purchase again in a heartbeat.