Can anyone share their experience with either product. Im looking to reduce the felt recoil, so the buffer spring seems like a good place to start.
Also JP pin seems to be a great way to lock the upper to lower, I did not want to use the accu wedge, that seem to defeat the purpose on reducing gap.
Please respond if you have any experience.
Here are quotes from the respected companies
JP
Finally, the Right fix for the “loose” upper/lower receiver problem. You can throw out that piece of rubber you’ve been stuffing under your rear take-down pin all these years. All it’s good for is eliminating the “rattle” in you gun. In reality, it does just the opposite of what it should. It pushes the receiver halves apart on a flexible interface. They still move when the gun discharges. The JP Precision Tensioning Pin actually pulls the whole upper assembly down and back on the lower with reproducible torque (for those really picky folks) and gives a rock hard fit to even the sloppiest receivers. Ask any bolt gun shooter, and they will tell you that a rifle loose in the stock will most likely not reach its accuracy potential. An AR with a loose upper/lower is no different. It requires no modification to the receiver. It simply replaces your rear push pin and drops right in.
Tubbs
The new Speedlock AR-15 Buffer Spring is designed to reduce the pulse andoverrun (that annoying "boing" or "twang") from your rifle, producing a smoother recoil cycle with less rifle movement. This spring is designed by 8-time national highpower champion David Tubb and carries the guaranteed 9002 quality control standards approval. It’s precise construction is unaffected by rapid fire heat and enhances the function improving life of the part. The spring has been duty rated for 500,000 cycle, which will function consistently for the life of your rifle. Designed for AR-15 use only.