I received my complete KP-15 receivers today, and am impressed with how beefy they feel while still being lightweight. Skeletonizing the rifle might be tough, the inside of the buttstock is mostly hollow, with ribbed sections on the top and bottom to add strength and probably provide extra mating surfaces for the vibration welding used to connect the left and right sides of the receiver.
The recoil pad was lightweight and mostly hollow, as was the grip. I was surprised to find it was hollow with reinforcing ribs when I ran a 1/2" bit inside to see if I could get rid of some plastic.
I swapped the buffer for Taccom ULW delrin buffer (1.1oz), swapped the mag release, hammer, and trigger out for New Frontier Armory polymer parts.
Weights:
- As received, full assembly: 27.7oz
- Buffer: 2.8oz
- Recoil pad w/screws: 1.3oz
- Modified, full assembly: 23.9 oz
I installed a 16" Faxon 6mm ARC barrel, with their 10" carbon fiber handguard, on an Aeroprecision upper, with a lightweight Brownells bolt that I picked up on sale earlier this year (Memorial Day sale?). Total weight with a magazine came to 4lb 14.5oz. Lightweight, but not ultralight at all. An Aeroprecision scope mount will add 3.4 oz more, and if I add a 6x SWFA (likely), it will end up a chunky ~6lb 6.5oz.... plus a suppressor....
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