This is a review of the JPSCS Silent Captured Spring by JP Enterprises
Rifle: JP Enterprises LRP-07 chambered in 260
Complete and easy to follow instructions are included with the Silent Captured Spring. I started by removing the original spring and buffer. Next I inserted the provided spacer (not shown) and then the Silent Captured Spring. The spacer is not needed for carbine length systems. It is recommended that the buffer retainer and plunger be removed but I left it in and have not experienced any problems to date.
When manually cycling the bolt with the side charging handle the first noticeable difference is the absence of what JPE calls the "spoon over cheese grater" sound. Although JPE manufactures their own springs the noise was still present albeit less than other large platform ARs. While this is a worthwhile upgrade in and of itself I consider it to be secondary to the functional benefit I will get to a little later. Also, when cycling the bolt it moves with far less resistance as though it is "gliding".
Initial load development was done with the stock JPE LPR-07 260 which shot .5 five shot groups. With the Silent Captured Spring installed I experienced no POI change and no elevated signs in pressure. Basically there was no change with the Silent Captured Spring installed.
I worked my way from 100 to 700yds prone with my original dope. I then moved to different barricades including shooting sticks and a tripod. I then had a fellow shooter perform the same test. In total 300 rounds were fired with the new Silent Captured Spring installed.
Our take away was that while the silent part of the Silent Captured Spring was a worthwhile benefit the greatest advantage was gained with quickening the recoil impulses. As many know there are several recoil impulses experienced when shooting a gas gun that one does not have with a bolt gun. The Silent Capture Spring seemed to bring these together. I would not say it is like shooting a bolt gun but it made it one quick impulse. The advantage gained in the alternate and uncomfortable positions would make it an upgrade for the completive shooter and hunter alike.
I will be at K&M this weekend for a match if anyone would like to give it a try. Maybe Shannon or Bryan will let us put a few down range after the match. http://kmprecisionrifletraining.com/