Does any one have any first hand experience with the Pantheon Arms Kentri Short Buffer System? There are numerous very favorable reviews on vendor/supplier websites. However, I'm a little leery of reviews posted by those who have a financial interest in circulating glowing reports.

The manufacturer's website is https://pantheonarms.com and this "system" uses the stock bolt control group. The "trick" component appears to be the use of a nested/stacked Belleville type spring along with a more conventional long coil spring.

Right now these "short buffer tube systems" are on sale at Vision Defense for $49.95 + $3.95 shipping.