1. Just curious since i could get the CA one really cheap
2. Not really in to the PDI one, got one i two other builds, yeah it's fine but have gotten better results with other HU's
No it is not VSR or even close to VSR HU, it does however have the adjustable arm thingy of the VSR butt the barrel and bucking is APS2/Type 96 (it is possible to fit the barrel and bucking from the VSR system with a little work tho