The Kaw Valley Precision AR-15 Pistol Buffer Tube is perfect for those who are looking to utilize a Sig-Brace, or other standard aftermarket pistol tube braces/accessories. The KVP pistol kit utilizes a standard castle nut and end plate (not included) for attachment to a lower receiver. This attachment method does away with the need for a strap wrench. Note: This tube doesn't work with the KAK Blade without modification.