Alpha Wolf

might be better asking in a post.

for the most part with enough work and effort you can turn anything into a "dmr" for airsoft purposes, although it can be somewhat immersion breaking when someone rocks up with a short m4 with an hpa kit that's "a dmr honest guv"

the m14 platform however is at least thematically appropriate as a dmr, however the amount of work required to convert is going to depend on what kind of base you're choosing and how far down the long range accuracy rabbit hole you want to go.

Epic 

@Flintlock has one, it's mega (and for sale).