Kaw Valley Precision Pistol Stock Completion Kit - Stainless Steel 5.4oz Buffer Black Medium. The KVP pistol kit utilizes a standard castle nut and end plate for attachment to a lower receiver. This attachment method does away with the need for a strap wrench. Without a properly tuned blowback system you run the risk of being overly destructive on internal lower parts. Running a blowback AR15 with a suppressor can further increase the risk for damage. Do yourself a favor and fine tune your setup for the softest shooting PCC possible with a buffer and Extra Power Spring. This kit is perfect for those who are building a PCC Blowback Pistol. Specifications for Kaw Valley Precision Pistol Stock Completion Kit - Stainless Steel Buffer: Manufacturer: Kaw Valley Precision Finish: Anodized Gun Make: AR Platform Gun Model: AR-15 Condition: New Weight: 0.5 lb Size: Medium Package Contents: Kaw Valley Precision Pistol Stock Completion Kit - Stainless Steel Buffer (1) KVP Extra Power 17-4 SS PCC Spring (1) KVP SS Blowback Buffer (1) Carbine Stock Lock Ring-Castle Nut (1) Carbine stock end plate What firearm models does the manufacturer say Kaw Valley Precision Pistol Stock Completion Kit - Stainless Steel Buffer is compatible with? The manufacturer suggests that Kaw Valley Precision Pistol Stock Completion Kit - Stainless Steel Buffer is compatible with AR-15Kaw Valley Precision KVP-PistolKit-5.4-SS: Pistol Stock Completion Kit - Stainless Steel 5.4oz Buffer Black Medium