Pistol caliber carbines such as 9mm, .40 S&W, .45 ACP, and 10mm are a blast to shoot but can be tough on AR-15's internal components. Without a properly tuned blowback system, you run the risk of being overly destructive on internal lower parts. Runing a blowback AR15 with a suppressor can further increase the risk for damage. Adding the KVP 7.5 oz Stainless Steel buffer is the best way to give your blow back system a fighting chance. Do yourself a favor and fine tune your setup for the softest shooting PCC possible.
There are many ways to smooth the operation of a AR-15
Carbine. One of the most cost effective and quickest upgrades available, is the
installation of a KVP™ Heavy Tungsten Buffer. There are many added benefits
once you install a KVP™ tungsten buffer. Benefits include: increased
reliability, reduced wear and tear of critical internal parts, reduction in
felt recoil, reduction in bolt bounce, as well as eliminating the annoying
"rattle" of standard carbine buffers. Manufactured to meet the
highest quality, KVP™ Heavy Tungsten Buffers are within a tolerance of +/- .005
oz, resulting in a more consistent, higher quality buffer.
Mil-spec AR-15 triggers typically have an 8 to 9 pound trigger pull with factory springs. Utilizing the KVP Reduced Power Spring Kit should achieve a trigger pull reduction of 2 to 4 pounds. A 5 to 6 pound trigger pull is typical after installation of the KVP Reduced Power Spring Kit.
The KVP reduced power springs are designed to reduce trigger pull weight in Single Stage triggers. Due to the magnitude of triggers on the market, KVP can not guarantee that ALL triggers will adequately detonate ALL cartridges. We recommend high quality brass cased ammunition loaded with commercial primers for the best results. Installation should be performed or overseen by a competent gunsmith.