The U-head is rubber coated to give you better stability for the rifle

also on the magazine front which has the same dimensions etc

PVC and Steel

all encased in a sturdy aluminum handle

as it is a bullpup design

Camelbak Crux Lumbar 3L Vandblære lader The U-head is rubber coatedHere we have one of the products that Camelbak is best known for, namely their Water Bladder. The Crux is designed to provide up to 20% more water per sip, as this has been requested by several Camelbak users. Crux is simply designed with a smarter spout for sucking, which can actually be "locked" so it doesn't spill water. It is of course 100% BPA, BPS and BPF free. This version is a 3 liter version